P = Muncie, 0 = 70 model year, D = April, 07 = 7th day, C = M22.
Does it have a large, fine-spline output shaft? You'll know right away if it has the larger yoke like a TH400 hanging out of the tail shaft. If you have an M22, I am envious.
Here is a link you may also find helpful:
http://www.chevellestuff.com/qd/muncie.htm