cylinder head question?/AGAIN

So Today i looked up the casting numbers on my heads that i took off the 383 i bought a while ago and found out they are from a 68 440?? the number was 2951250 they had a 2 brrl intake mounted to them so my question are these a good set of heads to do work on and get a good amount of power out of them or should i get some 906's or 452's??? thanks