CR and pump gas question

FWIW.... The so-called 'open' chamber Edelbrocks have .060" deep recesses.

If the dished Icon pistons for that kit are IC745's (20.5 cc dish + eyebrows), then you have about 9.8 Static CR with a .039" thick 1008 head gasket, the 60779 closed chamber heads, and a nominal LA block height. If they are the Icon IC984's, then they would be about 0.3 points lower (despite the catalog saying the CR will be the same) due to a .020" lower compression height.

I would be tempted to use a Mr Gasket 1121G (028" thick) to get the gap from the heads to the pistons down close to .040" (with the IC745's and a nominal LA block height) and have better quench effect; that is always a good detonation fighter.

BTW, IMPORTANT: You run DCR numbers with the advertised duration valve events, NOT the .050" valve events. It looks like you used the 40* ICA from the .050" valve events, and that would falsely elevate the DCR to that 9.35 number and probably is what scared you! That is not a correct number. That is what is wrong (IMHO) with the Hughes cam advertisements.... you have to make a good guess at the advertised durations to get to a DCR number.

I'm gonna guess that the Hughes cam you linked has at least a 280 advertised duration; might be a bit more. If so, then DCR is around 7.8 installed straight up (ICL=106*) and this should be easy-peasy to run on 93 with AL heads... easy to tune, and easy to avoid detonation.

FWIW..... I personally would not be scared to run hypers at this level with AL heads. I've run them with 14-15 psi boost in a rally car engine all day long... avoid detonation and you are fine. In fact, my son's 340 is at 8.0 DCR with KB hypers and the 60779 closed chamber Edlebrocks..... never has hinted at detonation on 93. 15 degrees initial and 35-37 degrees total for ignition advance numbers.