What do do with this square body?

[MARKDTN]

About 2 years ago my uncle died and left me this '74 C10 LWB truck. I finally got around to getting it from the farm last weekend since it was near the Nashville AACA swap meet. Its pretty plain with 350/TH350, gauges, and power steering. It's been sitting in a shed since at least 2008. Decent shape-both cab corners have rust, some rust and bondo in the front fenders, tailgate is rough. But underneath is pretty nice. The mice have been pretty rough on it. I am going to get it cleaned up and running but don't know what to do after that. My next project is going to be a '69-70. I have personal history with this truck as I bought it for him from the A/C guy in 1988. Patina shop trucks are hot now. I can't keep it forever. My initial thought is fuel injection conversion and power brakes, but this is really a pretty unmolested truck. 1974 is last year for points and no cat. Part of me wants to get it reliable and finish RT66 that I started last year. I need to go Joplin to Chicago so that is doable. But I wanted to do that in a '69-70. So what would you do with this truck? I already have a square body (bought from another uncle) but I want earlier.