Need some advice on some cylinder head gaskets

There is a window of quench where detonation becomes a concern, I think that range is like 050-090. Closer than that or further than that the engine has less of a chance to detonate. With the boosted stuff I’ve done it seems to make less of a difference where the quench is because the air/fuel charge is so dense. Especially so with an efficient intercooler. Usually it’s a non issue on boosted stuff because you are already octane rich due to needing good fuel when on boost, so off boost you have more than enough octane to keep it safe. Like I said in my first reply 10.5:1 and 10 psi puts you in e85 or 110 octane territory so you will not see detonation off boost with that fuel. On boost you’ll be backing the timing down pretty far to make optimal power and it will be well past peak NA torque so it’s less likely you’ll have a problem. If you’re not willing to run that quality of fuel you really need to consider a piston change.