Practically Clueless Newbie Needs Help Getting His Dart Up and Running

Because people don't do the math. In normal usage, a car usually puts 10,000 mile per year. In the first 10 years that would 100,000 miles. 30 years later, what do you think the mileage would be. Something considerable more then 100,000 miles.

Putting in a used engine is a short gap measure at best. Yeah you can find them cheap, but there is usually a reason . I consider any used engine a core a best.