Obviously grille swaps and interior swaps, caddy/escalade front end swaps.
If you are painting the door handles, the older trucks had smooth handles rather than textured like the newer trucks. 88-94 I think?
Kodiak door handles swap over although rare and expensive.
Go to a junkyard and grab an extra set of corner lights and the wires. Drill a hole in your upper corners and cut and glue the junkyard 194 lights so they will both light up.
2nd battery tray from a diesel (I think 454 trucks had them too)
Gmt400s have separate low and high bulbs so why not wire them both up? 4-high mod costs about $10
The brake lights only use one bulb, but you can wire the second one to come on so you have brighter tail lights. The factory used a dual filament bulb, but never wired the top bulb to the brake light circuit....
I read that you can splice in a switch and relay into the front axle actuator circuit for a 2WD LOW, but I haven't done that yet.
Wire a switch to the ABS circuit. Just pull the fuse and plug in a piece of wire with a new fuse and switch.
S10 blazer dome light lens fits the sunglasses compartment on the over head consoles, you'll have to wire in a dome light.
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88gmctruck added a Vortec windshield washer tank and gmt800 nozzles to his TBI truck for extra capacity and more spray.