1989 Dodge Dakota parts?

I need to know where I can find an engine, transmission and a new wiring harness for my 1989 Dodge Dakota. The truck has a Fuel Injected 2.5 SOHC 4-cyl, NP2500 5-speed transmission, 2wd, regular cab and short bed. The truck had caught fire near the back of the engine thanks to the lovley recall of the valve cover gasket failing. So I had it towed to my local mechanic who has done all the work on this truck for the 15 years my Grandfather had it. They repaired some wires, ect...and told me it now has bad compression in 2 out of the 4 cyclinders. I think they blew it up. So, I got a junkyard motor and trans. Switched over good parts from my motor to the junkyard motor ie: Throttle body, starter, cap/rotor, stuff like that. Now I have to play with the throttle while starting, sometimes holding it to the floor until it turns over. I wanted to put a 318 with a short tail 727 trans in it, But don't feel like changing everything. So any REAL HELP will be apperacited.