What should I do with my trucks

Hey all. Please take time to read this I need advice lol

Sorry if this post isn’t allowed. I’m just seeking opinions on what I should do with my trucks.
I’ll give a little bit of background, I have a little bit of a Facebook marketplace addiction lol, my dream trucks are OBS Chevys and so a couple months ago for my first truck, I bought a 1993 K1500 for $1000 off some kid who was selling it, imagine a truck that has been sitting in the mountains for a while- in that condition lol. It has a jasper engine I have no idea what kind there’s nothing on it that says what kind it is, needs new exhaust system, new back window, door panels and a new transmission. He gave me all the parts “that will make it run” he gave me a belt, a distributer cap and a couple other small things. So it’s just kinda been sitting for a couple months, and I have been making a list of what I need to get for it, and I went on marketplace yesterday and was looking for a part out of a 88-95 K1500, and I found this guy about 2 hours from me with a 1998 Z71, at the time I completely forgot that it is technically different other than the body so most things are not interchangeable to my ‘93. Nonetheless I gave him a list of parts and he said he will just give me the whole truck for $500 so I went up there and got it. Since it was a part out truck he was missing the bed, front bumper and front seats. He said it was a stock engine/trans trans was rebuilt 25k miles ago and engine needs a new crankshaft. Other than that it should work. But i thought that this particular one was fuel injected, I opened the hood and found it has a carburetor?
So what should I do, rebuild this one and ditch the ‘93 or rebuild this engine and put this engine/trans in my ‘93? Because my ‘93 is nicer imo, but I genuinely don’t know what to do. Can the trans from this new one fit in my ‘93? I really want advice on what to do.
If anyone wants to help me further feel free to reach out. And honestly, I will admit overall I don’t know what I’m doing when it comes to the mechanical stuff so I’ve been having some buddies help me.