Thank you guys for the input. It looks like I’m on the right track.
Andy how much porting would give me bang for buck. I plan to call modern
Cylinder head for an intake and hoping they have a cnc program.
For headers I already have the 2 to 2 1/8 coming.
I did find a Howard’s grind that’s 263/270 .675/.650 on 108.

Next question. Do I have to worry about lifter coming out of bores too far and uncovering the oil band?

Dragula I was thinking possibly the same thing for gearing. Thank you.

The rocker arm ratio affects the motor from idle to peak RPM, do the math on how much increase in the net valve lift and then decide if you want more lift on the lobes or do it with the increase rocker arm ratio 1.5 X.420=.630 gross lift,1.6X=.672. I check the net lift at the retainers and it had closer to .700 net lift than .670 That cam pulled really hard all the way from a idle to whatever RPM I wanted to shift it at including up to 7800 RPM
That motor exceeded my wildest expectations from day one with a set of ported big valve 906 heads all the way up to buying and using the CNC ported Eddy RPM heads and then with the dyno testing on both the Indy 440-1 and the Indy SR M.W. heads. The SR heads flowed 340 CFM at .700 lift and the 440-1 flowed 370 CFM at .700 lift, the 440 -1 heads made 50 HP more on my pump gas motor at a little higher 7500 RPM than the SR heads did at 7300 RPM More air and fuel in makes more power
I didn't work on the Indy 400-3 intake for either set of the Indy heads, it made good power and torque with all the heads I had on that motor with the same rocker arms with the Eddy RPM and SR heads, same brand and ratio on the 440-1 heads
On the head swap tests I used the same carb with the same jets and ignition timing, head change only, both Indy heads had the same 76.0 CC on the combustion chambers, same head gaskets also
I did test both sets of the Indy heads on my higher compression ratio 526 C.I., 440 mule motor, the 440-1 made 845 HP at 7500 RPM on race gas and the SR made 775 HP at 7500 RPM on pump swill
Good luck on your build, it should make a lot of power

As far as the lifter band uncovering, yes they can unless you bush the bores but I run the Isky solid body's so zero issues there......

Okay guys I got the cam today. Did some horse trading with a friend.
It’s
265/269
.660/.653
108lsa
Things are moving right along. 😀

Are you planning on doing any chassis dyno pulls when you're done? Would like to compare when I get done.

Yes, I measured this on mine. Many different lifter designs out there so that matters as well as the cam base circle.

Based on the hyd flat tappet cam I had, discussed how much room I had to decrease the base circle with the cam grinder and how much room I had from there for lobe lift without uncovering the oil gallery. With an MP hemi block, unbushed, .430 intake lobe lift I'm only about .020 away on each end from uncovering the oil gallery.

I’ll be at .412 lobe lift 🤞

I do plan to put it on either an engine dyno or chassis dyno 👍

Still, need to measure everything due to variance in lifter design and base circle.

My book shows 3.73 gear as being best starting line ratio with 4.25 stroke, 28' tire and 3400# for my car.

I just finished a 512 low deck stroker with 10.5:1, TF270s, deep ported Indy single plane, 2" headers, 1050 dominator, and a solid roller cam. It has yet to be on a dyno, but I can tell you that it's a beast in my 3200lb Dart. I'm running Caltracs and MT 295/65-15s and the car will light them up at will. Looking into Davis traction control so I can reliably put the power to the pavement.

Here is the cam card:

I do realize that I need to measure. I should of been clear. Thank you for the advice.

Very nice build. Is the times in your signature with this motor?

Yeah that is a healthy cam for the 270 heads, should make plenty of power up top that is for sure. Looks like you polished the motor plate? Did that take a lot of work?

3.73 probably would be a good ratio with a 28 inch tire. I decided that 3.90 was the best ratio for my Duster but I have a 29.5 inch tire in it.

Andy I’m going to be changing to a 295/65 or a 29” tire. So 3.91 may be my best bet. 👍

Where do I order a Indy 400-2 intake from? Can the valves use unshrouding on these heads? I have a friend that wants to do intake porting and optimizing.

You have a 8.75 rearend behind 700 hp?

Don't touch the heads. The Indy intake can be purchased from most anyone.