Hi guys/gals!

I need some help identifying the trans out of my '68. When I bought the car, the previous owner said it was about the only original part left on the car, and I think that's true, but I keep finding conflicting info on the web when I try to identify the trans.

Casting number - 3885010, and I think the date code is - P7T08
Driver's side of the case - 3884685
10 spline input shaft, 27 spline output shaft

My research leads me to believe that its an M21, and the date code (I think) supports my 68, but the tail shaft says - 3846429, and that's where I get confused.

Also need to know what this thing is worth, since I will be getting it up for sale soon.

Thanks for the help guys!

Scatter'd