They were early 80s cars if I remember correctly. I looked up the numbers. I scrapped one of the cases because it was cracked and the other is in my race car. I tried to get the numbers off it but the shifter bracket is in the way.
John is correct one of the tranny's was gone through but the one I ended using looked untouched but who knows.

When I bought all my parts from CRT he told me about all the variations he has seen.