I imagine this has been asked many times in different forms, iron heads, aluminum heads, w/quench, w/o quench, overlap, etc, but my question is assuming you have no quench and you use crappy 87 octane gas what's the highest compression you can run with stock iron heads and any cam?

I'm putting together a very mild 383 and I don't want any issues with detonation, don't even want to consider having a problem.