Fixite7. 327 4 speed Saginaw, yes. 327 4 speed + OD Saginaw, Russian Roulette.

There was a write-up by C.J. Baker in Hot Rod April 1975. The article was titled 4+O = 8.
The article today is, How To Get Done!" (https://www.motortrend.com/how-to/get-gone-grassroots-overdrive).
Be sure to click on, "see all 25 photos" to see needed details of the machining required.

Before you begin, read the manual on how to rebuild the 3/4 speed Saginaw transmission as well as the manual for the B-W OD.
Don't be the rookie that takes one apart and has parts fall out on the floor.

Performance rebuild information here (https://www.motortrend.com/how-to/ctrp-1009-saginaw-transmission-rebuild).
Be sure to click on, "see all 31 photos" to see details.

Last edited by buoymaker; 08/20/2021 5:08 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."