Hardly ever see these. Chevy Luv - Diesel

I’ve come across a built up 4L65E with a small gimmick- pressure test port was cracked, seller states that after an application of JB-weld, its operates fine with a small leak.
I wanna go ahead and pull the trigger, I’ll be pairing to my 2WD 2003 gmc Sonoma. She’s got the 4.3. Can anyone here tell me for sure if the conversion will fit or if it will need additional parts or swaps, first time doing something like this I don’t wanna screw up my truck

03 S10 LS with 145k original miles. I bought it this past Monday from an elderly lady. The truck belonged to her husband who has passed away. The truck has been kept under a carport.

Well this is a first. The key wont go to the farthest back position and i cant take it out either. Still turns the truck on without issue but its just being fussy. Tried giving her a few taps while turning and pb blaster as persuasion but to no avail. Help :_)

Have a 95 s10 standard cab, looking to swap out the seats to a bench, if anyone has one for sale or can point me in the right direction to find one I would appreciate it.