Get rid of the powerglide, unless you want it to be slow?
Having an original powerglide trans is nothing to brag about, it's something you should hide & burry it & put it to rest & out of it's misery. IMO.
Sorry for the rant, I just really dislike the PG trans, especially for a day to day street car in a low powered 6 cyl car.
A PG trans has there niche & can be a great trans for certain applications.
Good luck on your build!
The one thing I liked about my moms 73 Nova 250 & a PG trans, is that you could push start a PG tans equipped engine, but you need to be above about 20 MPH.
IMO.
