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If your E cams have no wear, definitely keep them. A stock E car (especially with higher compression) is faster to 60 then an S. If you go with S cams you will need to have the MFI rebuilt with an S space cam. Your E cams with the higher compression pistons will be an awesome power plant. Mixing parts opens Pandora's box and your wallet.
Those JE pistons have nice deep valve pockets. I would be very surprised if you have clearance issues if they are from JE and designed for your application. JE makes two versions. A 9.5/1 and a 10.5/1 CR. 9.5 is as high as I would go with a single plug setup and E cams. Both with require high octane gas.
Good luck, you won't be disappointed.
Chris
73 911 E
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