My dad picked up this tranny thinking he was getting a super deal on a Muncie 4 speed but when he brought it home I knew it probably wasn't. On the side is GM and the letters W.G. division. What might this be? It came with a pontiac shift knob and I think I decifered 1979 in the numbers. I'm wondering if this one might hold up behind a 350 like a Muncie M-21 would? Thanks for the help