Rebuilt Transmission and engine upgrade?

I went from a 5.3l in my 90 Silverado 1500 to a 6.0l transmission went out. So I dropped it and rebuilt it with a rebuild kit myself. I put it all in. And it feels like its attempts to go into gear but no luck. Took the line off to see if pump was pumping properly and no action. Linkage broke and everyone I get just will not extend enough to move it from the gear shifter to the transmission. I'm lost. Please help I've been ride less since it went down since before Thanksgiving. I. Out of money and options. I can't give up on my TrInItY!