452 and 906 heads should be cut to 80cc chambers!
But if you can find a set of 915 closed camber heads you can cut them to 70cc but one any of these he’d you will need to cut the intake side or cut the intake. You can actually get the compression up to 9.5-1 by decking the block and 80cc heads. I’ve done this with a 60 over 440 I did the pocket porting and port matching with 1.81/2.14 valves and the 557 mech Mopar cam. I did a refresh on this engine a few years back and put it on the dyno for the first time it made 545tq and 525hp with my 2’’ headers an 850 Holley. Carb size matters on a 440, 850 min.
I always ran this with a 3800 Turbo Action converter witch stalled at 4500 rpm low 11s in my Volary.
With the 440 you must do the head work and compression is very important, steel head gaskets are a must, carb size matters 850-950 and cam, if you’re using stock pistons your limited to maybe 5500 rpm, stock rods with good bolts 7000 rpm but I’d polish them.
The 440 is a good platform to build from, doing basic blue printing 500 to 600+ hp is easily accomplished with select parts using what Mopar designed
