My version of a factory parts build 318

Dan the man said
The 360 heads hurt performance from the dropping of the compression ratio.

While there is a draw back to the open chamber, how much exactly is the drop? Can this not be fix by a milling of the heads? Remember, flow trumps compression. Search IQ52 and read up on his low compression 400 build.

Dan the man said
The 318 doesn't benefit from the 360's bigger valve's and ports until the rpm's come up.

Really?!?! Hummm, at what rpm now?

Dan the man said
Show me what had to be done to get the 360 heads to improve the performance of a 318

Nothing. Run as is. Re-cam for the lower compression and rpm desired.