Speed-O-Motive carried a .030 over 318 350 kit for years based on a 318 with a 360 crank. Indeed, it would be pretty easy to do the Silvolite pistons with stock rods and the Scat crank, but I would just use a 360 crank worked by someone trustworthy. No reason to spend the the extra on a forging at this level. The 1978 up 360 crank is slightly stronger than the earlier ones. The fel-pro 8553 PT permatorque head gaskets compress in at .052 actual, but are only about $13 apiece and work well. The 1.658 compression height will put it down .029 in the hole or deeper if the block is taller. You mentioned you had ported 318 heads, what casting number and what do they cc in at? Have they been surfaced? Most come in at 62-63 ccs after a .010 cleanup. This comes in right at 9.9:1 compression. I'm really starting to like this build, the 360 crank I have laying around is starting to look really attractive to me right now!
