jay I started with 640 gk. After talking to DON and earl back in 1970 they said the 660's worked better then the 640's We both ran them,in 1972 out in calf don said not to try the 700's to hard to get them to work.never did try them .They were building a pinto with a 351c in it earl said they or he tryed to put a cammer in it but they ran the 351c.I put a cammer in a pinto best we got was 9.80 9.90 ran a 513 gear .Also a 557 not GOOD THINGS CAME APART IN THE TRANS, DRIVE SHIFT ON THE BIG END then we had to replace all the rods and two pistons but we had a lot of fun backthen.I like the 660's my son and I will be building a 64 comet in 09 with some of Coons parts and some of are owen.John
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