Stock 360 Upgrades for Crusher Cuda?

I would really like to run 12.90 in the quarter. Would I take .040 of the block or heads?
heads, because that 360 is going to have dished pistons and the 360 is in need of any compression bump it can get. Many will tell you that you have to cut the intake as well, but I've not had to and I've done it more than once.