There might be more but a lot of my pictures aren’t good quality

Edit: thank you for telling me about the first one being a ford, I am rather new to the classic truck scene and so I greatly appreciate everyone correcting me and giving me more information

Along with a red Chevy that someone at school has

Met George at a show this summer and asked about his truck. He bought it in 1958 while he was still in high school. It came with a 303 Olds and a three-speed LaSalle transmission. He raced it with a small-block Chevy for years, then in 1973 put the blown 392 Hemi in it.

On a 100-inch wheelbase its best was 8.93 at 157. He ran it at Milan, Martin, Kaleva and strips all over the tri-state area. It went undefeated at Onondaga and set a track record up in Quebec.

68 years with the same truck. Full story and more photos here: https://garagechronicle.com/cars/1934-dodge-pickup

The only one that I know the exact year for is the fully red one with no door handles which is a 1952 Chevy 3100

Check out my 1975 Chevrolet C10! My grandfather bought this truck new in 75. It spent most of its life in the barn at the family ranch and was mostly used to drive into town for supplies.

When he died a few years ago, his brother (my great uncle, a classic car guy) took it and redid just about everything mechanical except the engine and transmission. I recently got it back from him. This truck has tremendous sentimental value to me and I want to make/keep it mechanically sound while preserving the stock look.

The paint and interior are original (has been garage/barn kept for all 51 years).

I have moved it back to the family ranch where I intend to fix it up and drive it around town when I'm there. It won't be a daily driver, so I'm free to spread out the pieces in the garage and take my time.

I could use some help getting started with this truck. I'm about as handy as a human can be, but don't have any specific knowledge about these models. I have every tool known to man at the ranch, including an auto lift. My questions for you experts:

• It's about 70 miles from where I picked it up to the ranch. I burned half a tank of gas on that drive. Is that normal or do I have an issue? It drove great with no issues beyond me being spoiled by my modern SUV!
• The AC system was completely replaced within the past couple years, but I couldn't get it to work. I suspect there is a refrigerant leak. Any tips on tracking that down?
• I don't believe the engine or transmission have ever been worked on. Should I get the transmission serviced/flushed? My great uncle says leave it alone if its working.
• My great uncle thinks there's an issue with the piston rings. Would I be crazy to make that my first engine project? The closest I have come is rebuilding a carburetor when I was in high school (30 years ago).
• I'd like to add some speakers and a Bluetooth stereo. Is there any way to do that without ruining the classic look? I am good with electronics, but if there's a drop-in solution I'd prefer that. I'd be fine with a bluetooth head in the glove compartment, but I'd like to use the original volume knob if possible.
• Is there a common way to add a shoulder seat belt? It currently only has lap belts.

I appreciate any input y'all have!