This is your cam:

Advertised Duration (Int/Exh): 268/276
Duration @ .050 (Int/Exh): 226/234
Gross Valve Lift (Int/Exh): .494/.513
LSA/ICL: 110/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1800-6200

You'd need a ton more cam to bleed off 11:1 compression. Start asking your machine shop about flycutting your piston tops if you what to run those smaller cc edelbrock heads.

IMHO you are stuck with an open chamber head with 72+ cc's. I think that will be X, J, or W-2.

X heads by your calcs give you 10.2:1. That might work with 93 octane. But you'll have no quench and cast iron heads that tend to promote pinging vs closed chamber alum.