good question...im doing a 318 build myself(picking my block up monday from machine shop)
im no pro engine builder by far but after weeks debating what to do and what will work,what im doing is i bought flat top pistions with 4 valve reliefs speed pros similer to kb167..and had the block zero decked...i to am useing 63cc eddy heads i bought new for 1200 bucks craigslist ....i calculated compression and it puts at 10.5 to 1...no my debate is going with a voodoo solid cam or mp purple cam...im useing 273 adjustable rockers bolts right up..and a .028 in heads gasket i believe havent bought em yet but i think that what i entered in the compression calculater