yeah but I have worked on the same years with trucks and see frame cracks, steering gear boxes bust out of the frame, cab mounts crack out of the cab, radiator core supports corrode away, sheet metal start degrading, wiring starts shorting as the insulation degrades, brake lines and hoses rotting,

 

I have rebuilt helicopters with 30,000 + hours
if you figure 50 mph as an average that is 1.5 million miles. steel or aluminum it is a lot of a fatigue

 

metal fatigue!
I have owned high mileage trucks, frames, axles, steering !! everything!!!! starts breaking

 

I have this one buddy who's an engineer. Everything he does is waaaaay over engineered and over complicated.

His jeep has been parked in the woods for the past year and a half because he started replacing the floor and then started over complicating everything.

Im sure the OP will take the measures to give the truck a good once over before he drops a motor into it.

Next time you intend to scrap a truck due to metal fatigue, call me first.