Sometimes there is too much info available to process...
I like this page for comparing early Chevy 6's. Really does not address 55 or later cars/trucks, but maybe there is something about the motor mounts you can use.
URL This page covers 60-66 trucks but may be useful as well.
Link Does your motor have a horse-shoe front mount as shown?
If none of this helps - then I apologize.
Good luck with your truck.
