What pistons?
Some of the Older TRW stuff requires diff clearances than the newer CP, Diamond pistons, they don't expand as much, which requires tighter piston/bore clearance.

[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]