71 DEMON - slant6/3 speed manual to RB/727 - Questions!

Im with you buddy! But unfortunately I have more time than money and I have a set up thats ready to go in as-is so ill stick with that for now, but if I come across the right bits I need to swap over to the 4 speed @ the right price ill definitely jump on 'em!!!

Also, Has anyone ever shortened an 8.75 out of a C-Body for use in an A-Body? Im planning on using the one out of my donor car ('66 New Yorker) but I heard theres an issue with the axles not being able to the resplined???