My suburban is 90 and the 454 came out of a 91 1 ton truck
The trans has the beast sunshell, hd bands and clutches, corvette servo, new planetary set, new main shaft, and shift kit, there could be more but I don't know transmissions that well.
Still using the mostly stock tbi, I change the spring in the fuel pressure regulator to bump up the pressure, put in a wide band gauge and have been running fine. A chip might help but air fuel ratio is fine so I haven't worried about it.
30 over, procomp aluminum heads, 202/160, stock rockers for now, I want to try a set of 1.6's
Don't remember the dish on the pistons but it is 9.5:1 CR
I use this same trans cooler on both my trucks. Made my own lines, the feed line goes to the radiator then to the cooler before returning to the trans.