307 to 403 swap

[fleming442]

Also, keep in mind that Olds torque kills 5 speeds. Stick with a built 4 speed or get a TKO 6.

 

[pagrunt]

The G body bellhousing and release fork are odd ducks, and I don't know if you can get one in a BOP pattern. BUT, I do think I've seen people post about having T5s behind 260s. If you could track the stuff down, it might not be too bad. It would definitely be easier and cheaper to just slam an auto in, tho.

It's out there, not as (somewhat) common as the Chevy 10.4" but easier to find that the Chevy 11" one for our cars. The T50 cars only had it behind BOP engines.