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I should have read your full post better concerning the 2.2 s pistons. so my experience was going to 2.7 8.5 cr pistons because that was all that was available in the early 80s. the 66 crank with the 90 pistons gives you 2515 cc with about 8.0 cr. I now have a 2.7 with 8.5 cr I will put L/E cam, webbers, ssi/exhaust from my blown 2.5 expect 200 hp. I'm going to keep all my 2.5 bored case in the event I don't like the 2.7. the best imo is 2.0 s/e countercrank, 9.5 je 2.7 piston. that would rev well and make 220? If you'r sticking with the 2.2 higher cr pistons I wouldn't try to use the 2.4 crank its only 110 cc bigger and you have expense and maybe have issues with the really high lift from the bigger throw crank. also realize that the 2.0, 2.2. 2.4 and 74 2.7s all have 32mm heads where as the early S and 75 and later S have 35 to 36 heads. So if you want to really spin up for power you need counter crank and 35 or bigger heads. If you use the 2.2 S pistons on 70mm crank you will have good cr but I think you'll need better heads to take advantage, solex cams are pretty radical (almost to the S level) so if your mainly street I'd get E/L. read anderson's book as he discusses all the options S and solex cams and says the 2.7 with webbers makes almost exact numbers as mfi
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