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The reason for changing the pistons is so you can use a higher lift cam. When you change the cam and piston the CIS goes by-by. You can however add EFI which in some circles is better than carbs performance wise and certainly emissions wise. Do you have to retain the catalytic converter? If so you will need a more modern version that is freer flowing. If you can swing it, the 3.2 SS engine is nice but the pistons AND cylinders will need to be replaced to 98mm. You can dig a pretty deep hole in no time...I did.
I have a 3.0 SC with 10.5 : 1 JE pistons and no problems to date. I tried SSI but they are too restrictive to let my engine rev. SSI with 9.5 : 1 JE, GE 40 cams and a hotter ignition source will definitely make a difference, but you'll still have to change the induction. 250-270 hp? No way.
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