400 200hp( I think) ST-10 BW 4 speed. On the side of the case there should be 9 bolts on the side cover. Muncie's had 7. No exceptions. Also on the right side there should be either 902,903, or 904 casting numbers with the 904 the strongest of all three. The other two, if I remember are aluminum made. The M21 designation code is for which ratio 4 speed to install. There are over 7 ST-10's available with a wide range of gear ratio's. There was one a 4 groove 2:88 1st gear, that was designated for the Corvette. Super hard to come by. It was aluminum as well. Neat car. Don't see too many of them like that around for sale anymore. Enjoy.
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