A combo,I helped assemble: A 340,with a .170 thick deck,after milling, some dome down. (old school Arias,fit at .009 piston to block recommended,old school...)
We(my ex- boss) ended up with a hotter than 250 shot(homemade plate), single shot ,old school long lines).
He wicked it,into the high nines,on those pistons on pump gas,four years of tuning....(Patience,and experience)....