4 speed trans id and other info needed

i got this trans from a friend and was considering putting it into my 73 plymouth scamp. considering using this doing a small block 340 .4 speed build
here are the casting numbers
h4 and over is C99129 .stamped onto the pad is PP8332880 4319 and above that is a very faint no stamped 9E168355 the tailshaft is a C99126-1
any other info on what all i would need to do this would b greatly appreciated. thanks

23 spline input shaft standard slipyolk