Re: M-20 with L-78 or L-72 & deep gear -How?
Back around 1970 Alger Press in Oshawa was printing service manuals for GM. They probably printed other stuff for GM as well.
Our COPO Chevelle came with the M20 and the 4:10 gears. We had an M20 in our L78 4:10 geared Chevelle while freshening up the original M21. I prefer the M20 for street driving. A drag strip comparison might be interesting.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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