I don't have any bog problems, or lag problems with my factory Holley 6bbl carbs.
I had Promax go through them for peace of mind and I needed a screw hole in the accelerator pump diaphragm "clam shell" fixed. I had them use the correct Holley rebuild kit parts, and had them install the jetable plates and metering block, and the angled idle mixture screws equipped base plate in the rear carb, and "pretune" them on their dyno mule.
They ran good before I sent them in, but for my one man business schedule and the parts and repair I needed done, it made sense for me to let them do the work.
I will contact The Carb Shop and talk to them about that setup. Thanks.

EDIT: NOT "my" block. Thanks to the forum for the info!
What a difference a year makes...
First and foremost, THANK YOU ALL for the conversation and advice.
I see it as encouragement. The Bill Mitchell aluminum block is paid for, and that's as far as I've gotten. I've had a "vacation house" under construction and the thieving CONtractors and gypsy dope fiend "workers" plus the astronomical increase in materials has been a NIGHTMARE. It's now basically finished.
I'm hoping the ModMan fits under my N96 hood, and I'd like to run a taller than stock air cleaner. I may be best served with an A12 type scoop, the taller one that's a bit bigger than the factory scoop.
Some days, I just hope I can get the block built out w/in the next year or 2. Turning 60 at the beginning of 2022, having been to the funerals of 3 friends in 3 years, I know my time isn't infinite.
All of the parts and systems that I wrote about are installed, and the Calvert split mono leaf springs were a big improvement. It's funny how you can't really tell your leaf springs are worn out until you see the effects at the track. I have had ZERO time at the track to make any adjustments or even try out my HitMaster launch control.
The guy I mentioned that was using the Weiand on a stroker, with 3x 500 CFM 2bbl carbs he made, progressive mechanical linkage, has decided to go to a 2x4bbl because the Weiand (as has been mentioned here) is limiting his performance, in particular the RPM range.
It's come to the ModMan, Indy has a CNC program for Max Wedge port size, and they only charge about $100 to do it.
So I hope to make the time to be able to drive my Roadrunner again, get to the track and see what kind of times I can get with all the traction and strengthening aids that I had installed, see what the HitMaster and McLeod RXT dual disc clutch setup can do, and so on.
Again, thanks for all the replies and advice!

'tis a thing of beauty. Congrats on the purchase!

Looks like you'll probably need a Hemi K frame, and some Hemi motor mounts (or conversion mounts, or a motor plate)

I'm not familiar with the motor mounts to identify them by sight. I have a QA1 K-member installed, and I had spent extra last year on a pair of Mitey Mounts that have metal "T" shaped supports in the rubber to prevent breakage or excessive travel.
Are you saying this block has "Hemi motor mount" pads and those are different than RB/440 mounts?

That Block in the pics above has HEMI mounts. THe mount is the flat pad with three holes on each side of the block

I left a message with Bill Mitchell Products, but I don't doubt you.
I'll have to see what my options are. I certainly am not changing the QA1 K-member I just recently had installed. Maybe Mitey Mounts has something. I appreciate the heads up.
I'll follow up with any significant info from Bill Mitchell Products.

Hmm, look at the top row of head bolt holes. Isn't this in fact a Hemi block? That would sure explain the hemi mounts.

Wedge head bolt pattern.

Pic taken from BMP website. Notice the difference in how far the top head bolt hole is from the bore in both blocks. Also note the larger untapped upper head stud clearance holes in the hemi block. Now look at the pic from the OP.
Pretty sure that's a hemi block.

It occurs to me that he says he paid for a block not that he actually has one. Those pics he showed us may not actually be his block. Appears to be sitting in a machine shop. Could be anybody's shop even BMP's.

It is in the machine shop. I'll reach out to the builder and convey my concerns. Thanks guys.

Ask him if the upper head bolt holes go into the valley (hemi) or not (wedge). Or put a 440 gasket on it and see if holes line up.

The builder has assured me that it's a RB block from BMP. This isn't his first BMP build.
Check this one out...

That one is not a BMP block

Yes sir, that's exactly what I was attempting to communicate.

Hemi is also on the RB platform so the builder is correct, it is an RB.

It might be a good idea to ask the whoever the builder is why the new Wedge block doesn't have any
Wedge Motor Mount provisions (like the ones shown on this Wedge block)...........

There's that.....also noticeable are the HEMI oil drainback holes in the deck surface which help explain, but I don't want to get too technical....

Trying not to be harsh.....here is my cast iron garbage: Hemi in red....Wedge (machined off) in blue.

I mean, pretty sure that isn't a Wedge block he has there....but maybe it is an opportunity?

There are a couple six pack intakes available for Hemis.


And he said he wanted a 540 aluminum block, and it had to have a 6 pack. Well okay you can do that.

I don't think he said it absolutely had to be a Wedge, or did he?

As far as I know, there is nothing wrong with a 540 aluminum Hemi with a 6 pack

Make the most of it...just do that

You guys are GOOD!
I made a couple of calls, and that is a hemi block.
Maybe I should just wait until I get mine built out to post pix...
I'm sorry for long, drawn out, tedious threads, but it is taking so long and so much effort on my part to make this happen, that I find the engagement here on the different topics, questions, concerns, and just bouncing stuff off the forum REALLY helps motivate me and keeps my mind entertained, and my heart and soul happy enough to keep plugging away.
So, apologies for what may test your patience, or seem repetitive or nonsensical, it helps me keep on keeping on, until the glorious day when I can say "I made it, and here's the finished product"...

Aw man....no change of plans??? Just do the hemi with a 6 pack. Why not.

Kidding.

Keep the threads going.