I'm .0612 off my 906's with the dreaded kb162's and Mopar shim .020-.017 or whatever the h$ll they're making this week? My chambers cc at 80-80.5 across both heads (got lucky) that equates to 9.7-9.8 again dependent on the gaskets. Feel I'm at the edge of comfort with pump. Add headers and a 220ish cam I'm guessing just under 400hp. With 10.25 and stealths he might make it with manifold?.?.? For sure with headers..But again piston selection is key. FWIW I wouldn't waste my time to throw the 162s at a cat let alone put them in an engine. But that was my most economical choice 12yrs ago.