This is my first post so bear with me here.. I purchased a 1988 Power ram 50 in the back half of 2019. The truck had almost Zero rust when bought (virginia truck) and 77k original miles. i have since fixed all the rust, and re-painted the outer shell of the body (no door jams) in the original paint code color. I'm flirting with swapping a 318 into it but im not sure because I have literally all of the original booklets/window sticker/owners manuals. Is it worth re-building the ole 2.6? It has some ring blow-by I think and original exhaust. So im not positive it's the rings. Basically im asking how much are these things worth in the complete original state. And would I be doing it an injustice by swapping it? Everything works as is and I bought it as a beater but I've yet to see another ram 50 in my state (Indiana). How common are they anywhere else?

Pictures before and after paint can be posted if you'd like to see it. But id have to download from my phone so let me know!