That is where everyone would love for stock 318 LA block/piston owners to be able to go on static CR. But I have worked that challenge out multiple times and the answer is always the the same.
With:
- stock 3.91" bore
- the best stock 318 piston height of about .077" below the LA deck
- .028" thick head gaskets
you come up needing 53 cc chambers to reach 9:1 Static CR. That'll take a mill of somewhere around .100" +/-off of the typical open chambered 360 head of this type. That basically takes all of the 'open area out and leaves the closed chamber shaped part only. That much off seems tough (but I have never tried to have it done). I know /6 heads can take that amount of milling but I am not sure on these. And you would still need to see if the valves would clear the smaller 318 eyebrows. (They may....)
So, I would lean towards keeping the cam smaller and doing the best you can with a not-so-complex mill job (like maybe .050"?).
Or accept the low end dogginess and gear up (like to that 3.91 ratio) and push up the TC stall and work the gas pedal to get around it. Works for the strip; but may not be what is actually desired.
