Big block makeover help plz!

Gawd! Those are awful pistons,why do they even make them?,..........oh that's right, lots of restored Polaras running to and from the cruises that don't want to drop the coin
for silver let alone premium. Getting high squeeze out of a 383 w/closed chamber heads is a problem? Exactly how high? The OP isn't reaching out for 12:1 here,lol! Still,
You're screwed Dude, piston-wise You're stuck unless You want to buy new ones.....get MP's porting templates for stock BB heads, a right angle die grinder and some burrs
& get busy. Check the cam timing, then get the fuel & spark dialed in....................