Upgrades

[Jered1987]

Got my 86 k10 with 350/350 combo 14 bolt rear 10 bolt front 8 lug conversion,
255 85 16 elderado trailcutter tires. No ac. roll up windows.
Everything under the hood is a mess missing 90% of the ac stuff
Most of the emissions equipment is gone. Computer is gone? I guess, not hei ignition now? It's a half assed mess. Transfer case is leaking engine pans leaking probably transmission too. I'm wanting to do lots of upgrades in the future I'm wondering if I should just yank the transfer case transmission and engine completely and put in a new harness, I'm wanting to add lots of electrical, vintage air kit,led headlights, power windows, fuel injection ,sound system, car alarm, power locks, etc. I'm wanting to completely redo the interior too.

So my question is ultimately should I just yank everything and redo it?
And what harness? And what fuel injection kit for my 350? Thanks