360 heads on a 318

I just cc'd my "587" Jheads, tht are going on my 360. They checked in at 73-74cc. Not a big deal for me because I'm running zero decked flat tops.

I know this doesn't really help the op, but if you were building a 318 from scratch, and wanted to use 340/360 heads, are there pistons available to make up for the compression, or would the block have to be cut drastically to zero deck them?