Some things come to mind:
#1. I absolutely love the sound of that M-21. I had an LS-6 in 1970 and I loved it then and still do.
#2 It must be nice to have a second pair of hands to install transmissions. I never did. I did it solo. Oh well.
#3 Note how perfectly that shifter "snicks" between gears. Those steel linkage bushings are the bomb!
#4 Nice Video's. Thanks!
Bill