Small block combo suggestions

182 is about perfect for aluminum heads. For iron, down around 165 will work.
I think you're gonna need to lose some cylinder pressure.

Ok I'm gonna check wt another gauge and report
So what are our options ? And still keep the intended purpose of a cruiser. Alum heads, cam swap? Head gasket
I've got a call to my machinist hoping he still has his notes.
This would explain the detonation issues.