For all around driving, if I really have to go with a 4 speed, I'm an M-20 guy and then gear the car mild. I really don't like M-21's unless I'm running a 3.73 minimum.
But sort of sounds like your mind is made up for you if you already have an M-21 sitting there.
Personally if it were my choice I'd just run a TKX and ditch the Muncie stuff.
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2019 Pontiac Heaven class winner
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