12 second junkyard 318

I completing a project I bought,were the previous owner copied the 415hp build from engine masters.

http://www.popularhotrodding.com/enginemasters/articles/mopar/0667em_mopar_318_engine/index.html

My 318 has a forged 340 crank,eagle sir rods,kb167 pistons,zero decked,
comp cam XE275HL, specing out at 231/237-degrees duration at 0.050, and 0.525-inch lift, on a 110 degree lobe separation angle and Edelbrock Air gap intake.
I got some j bare heads with this project and was thinking that the smaller valve heads would work better.
Consider buying RHS heads from brian at IMM,but still believe the smaller valve heads would work better.Of course I will mill whatever head to 60cc chamber to get 10;1 compression.
Looking at Hughes Racing Iron Magnums and Hughes RHS heads W/ 1.92' INT, 1.620' EXH
What do you all thing about this setup?
TXDart