Unless you want more of a racecar, you would be better off leaving the 3.55 and replacing the M-21 with an M-20. Your first three gears will be very much like having an M-21 with 4.10 gears. The down side is when you hit fourth gear, but you are doing about 90 when you do that. However, make sure you really have an M-21 first. I cant tell you how many M-21s and M-22s I have looked at that have all turned out to be M-20s.
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Jim
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