Adapting it to the GMC might be a whole other project. I'm not sure.
I'm actually going to look into that... Being a hydra-matic right now I'm curious what bolts up... I know (or think I know) that the Powerglide thru I believe the modern 4L60E/4L80E should bolt up to the same stuff but this era, late 50's into the 60's, seems to have some unique exceptions to that rule.
EDIT - Misspelled "hydra-matic"...