Well.,,,
if the 3 spd trans was like my Saganaw 3 spd in my Camaro,,,it mounts the same,also a short tailshaft 350,Aluminum Powerglide,Muncie 4 speed,I even installed a Monza 5 spd in the stock tranmission crossmember,IIRC, I just had to slide it back a couple inches for the 5 sspd,IIRC,it was called a T50???
MBHD