Passing C10 to 16yo son.

[softballnrd27]

I've gone back and forth on this a lot and I finally settled on passing down my 85 to my oldest son when we get back from Okinawa. He will be 15 so I will have a year to make sure everything is good. Paint and body work are going to be done the last year that I am here so that will be good. It has an 04 5.3l/th350 w/completely stock 10 bolt.
Plans before passing:
Better exhaust system headers to tailpipes
American Autowire Harness
4l80e trans
Rebuilt 10 bolt with posi and 3.73ish gears rear disc brakes
Tires and wheels of his choice
New weatherstripping
Possible A/C heater at a minimum
New carpet
Nice stereo system
Auto meter gauges
Spray in Berliner
What am I missing? I want it reliable and as safe as can be. I am open to any/all suggestions or constructive criticism.

As for me I am going to start looking for a 64-66 swb, that was my 1st truck and I really want one!!