Pulled engine out of donor green mobile..But before we did ..the 79 runs a short 4speed , very much like old 510s ( square pan ) but the auto we are replacing in car we are fixing is a long tail.. So before we took out engine we test fit a long tail 4speed out of an mid seventies 620 , so that we could see if short driveline ( original to auto ) would bolt right in if we found a truck 5speed ...And to open up our options , sooooo ,, our options ( that are direct bolt ins ) are now short 4speed , dog leg 5speed, 720 changed bell housing 5speed , 620 type 4speed and long tail 5speed..
...When we were closing down for the night a friend rolled up to borrow a 30mm socket , and he mentions " hey i think i got an old long tail 5speed laying around " then takes off THEN reappears with the damn thing......
Compression numbers of new engine
Original trans from donor and 620 4speed
New free trans.........