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Pretty large intake ports for a 2.5. With the RS pistons compression will be quite low. How about finding a 2.7 crank and rods? Then you can get up to 8.5:1 CR and have the displacement to use those intake ports. Has the case had piston squirters installed? A must for those nikasil cylinders. Case savers would also be essential. Check, also, for the oil bypass modification. Which oil pump does it have? I don't know about the cam. I don't have specs handy.
-Scott
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'70 911E short stroke 2.5 MFI. Sold 
'56 Cliff May Prefab
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