I went with the 270 head because I know im at my blocks limits. Car went 9.80’s with my 240 heads on my 470” with a gasket matched hi ram and 750’s. I’m guessing new setup good for another 60-75hp. We’ll see
I assume you have enough compression and cam that takes advantage of that so you can easily expect more than you assume with re ported 270s and Indy tr done by Wilson with 950s on top. How it exceeds your expectations!