Re: M21 vs T10
It's been a few years but I swapped out an M20 for a Super T10 in our'72 Lemans Sport. It had the factory Hurst shifter. As I remember it was a straight across swap with minor bending of one shift rod. Everything else bolted right up. I think the slots in one set of shift arms are longer than the other so you can switch one way but not the other. The ST10 worked just fine.
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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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