Aww man Scott if I knew you were giving them away I would have looked at them closer. I thought you were saving them. Guess I should be nosey and ask about everything.
Anyway I think the 4 speed is a saginaw although I didn't look very closely. I think all three shift knobs were on the side cover like a saginaw. I think the Muncies and T-10's had 2 knobs on the cover and one back on the case. I could be wrong though. wouldn't be the first time. (nor the last unfortunately)
www.dandltransmission.com/tran1.jpg has a visual identification chart.