Found a peanut, Found a peanut, Found a peanut just now!

Was working on my grandfather’s old ranch (split to all the aunts, uncles, one cousin, & momma) today when I came across a 5.9 magnum equipped 2500 Ram extended cab truck rotting on a hidden portion of the property.
I ask my cousin what’s the story-

(It has bald tires) Someone rolled the truck 2-3 years ago driving it working for my uncle AND he saved the truck because he had replaced the engine right before his worker rolled it. I think I ‘m gonna get this for a song or a political promise.

What concerns do you have for:

A rolled vehicle engine or transmission?

The engine or transmission sitting stagnant for 3 years?

The radiator, condenser, & overall engine bay looked great (pics to come when I have a chance) after a fat bastard dodged wasps like the matrix opening the hood. Mothertruckers I still got the moves cause those flying stingers (12 yellow jackets) never struck once! I emptied a can of hornet spray a minute later in a battle of midway re-enactment, still ducking and running like my 6 year old girl.

Airbags deployed, passenger front suspension damaged along with roof...

Are the leaf springs long enough for my 74 road runner? Expected rear axle or rear gears for a 2500 Ram?

Would the (late model ?A518?) transmission fit the 74 RR without altering the torsion bar fitment of the transmission crossmember?

What are the A518 gear ratios?
Can I use the harness for the motor? Where do you cut them??? How?
I guess same for the transmission:Can I use the harness for the trans? Where do you cut them??? How?

Computer necessary or standalone available?

I never considered this direction until manna started falling from heaven.