Hey guys, I got what I belive is a m-20 or m-21 muncie and i need some numbers checked out. they are as fllows:

Side cover - 3831707
Main Case - 3851325
Tailhousing - 3846429

Any help would be very usefull. TIA

The numbers are from a 63 to 65 Muncie. Look on the input shaft to see if there any rings or grooves. An M20 will have none, an M21 will have 1 groove.