The most power I made on that 470 was 775 hp with the TF270 heads. That was with flat top pistons and pump gas. To pick up the extra power I switched over to a Wilson ported Indy intake. The OOTB Indy intake didn't work all that great but once Wilson worked it over it made really nice power. Cost a ton of money but that is how it goes. We ditched the dry sump system and switched to a wet sump setup using a high end Moroso pan and an external belt driven oil pump. The oil pump has a vacuum pump mounted on the rear of it so they were both driven by the same belt. Kind of a cool setup but once again, kind of expensive. Anyway, with the vacuum cranked up to 15 inches the engine hit 775 hp which is pretty good for those heads.
We built a drag race 505 with the TF270 heads. Big roller cam, high compression, etc. but it didn't make as much power as my pump gas 470. Not sure why, probably because the camshaft wasn't "perfect". I did a fair amount of camshaft testing with the TF heads and they are picky about what they want. Duane can steer you in the right direction if you decide to use TF heads.
https://www.motortrend.com/articles/dyno-tested-vacuum-pump-help-engine-make-power/

I've never seen the TF 270's,

How do they get around a pushrod Pinch without using an Offset Rocker? It's hard to believe they can get the Intake port to flow what they do (and better with porting) without one.

My Chapman MW's used a .485" offset rocker...and that was after relieving the outside walls a bit. (~.550 would be ideal)

As I understand it, the TF270's flow roughly about the same (Mine flow 285 @.400,335 @ .500 and 360 @ .600) without an offset and only a 2.19" intake valve?

I was wondering the same thing. My Edelbrock Victor heads have offset rockers, and the pushrods still rub a bit on the intake port before some careful clearancing. Not a lot of room there.

I don’t understand the questions……..TF 270’s don’t require rockers with additional offset.

In the same way MW Indy EZ’s and SR’s don’t.

Not really a question, just wondering how they seem to get ~360CFM so easily.

But I haven't seen the ports up close so wondering how they get the same flow numbers that used to Take an Offset rocker to get. I would liken the TF270's to compare more to an Indy -1 than the non-offset rockers in terms of flow.

Can an EZ-1 flow on par with them with porting these days...affordably?

it seems like they must corner the market just on the bolt-on savings of not needing special Rocker gear alone.

If i could get those flow numbers almost 20 yrs ago (when I built mine) without special dog leg Intake rockers and also have a straighter angle between the Lifter and Rocker...I sure would have at least considered them.

I've been out of the BB stuff (not out just paying a lot less attention to it) for a while, just trying to get back acclimated.

EZ295’s and SR295’s can both flow 360 with a decent valve job and some minor tweaking.
I’ve also hand ported both into that flow range.
Std rockers.

As for cost, nothing gets that close in flow for what the 270’s cost.

Great idea.
I may have to make a Lexan cover to replace the removable center section.

The TF270 heads are the easiest and cheapest way to build if you're shooting for 700 to 750 hp. Especially if you go with the new Trick Flow 4500 intake.
The Indy EZ and SR head will also make that power but they cost a little bit more and require a little bit more work. If you're shooting for 800+ hp then best to start with a bigger head. I think the TF270 heads will make 800, but it would be a lot easier to just start with a 440-1 head if 800+ is your goal.

It would be interesting to get some measurements of all the port areas. Since the head uses the same intake seat as their Ford 385(429-460) head, a bigger intake valve, throat and bowl work, with a shrunken exh. valve might prove interesting.

It sux that a good block to support 900-950 HP and live is $6k.