5.7L hemi Duster/resto.

Well I decided ta start taring down my 4-speed. everything looks ready good inside. Can anyone decode this for me. I was told its a a-body. But its good to know for sure.
the stamping on the
case reads 2b161801. PP8333700 0 12
Casting C99129 H

Tail casting- C132123

Cover casting-C99386

Its a 23 spline. I wanna make sure its a true four speed and not a OD trans.

Also I have an aluminum bell. Are the aluminum bells weak or will it hold up good?
Thanks