BB727 back half tail stock..

SMCARNUT said
Also just for your info all the parts inside a small block 727 will fit a big block 727 and vice versa.

If their the same year series that's true but through the yrs they made quite a few parts changes. The front splines on the output shaft changed angles in 76 and again in 93. Pumps had some changes as well as rear clutch carriers also