[RalphP]

I'm just listening In because I'm in the exact same boat. I have a 89 3.9 and would really like to get some more power out of but I think a motor swap is out of my league. Also do you have to chanel the motor mounts as well or it there a motor that just drops in. And second of all if I were to do a motor swap I'd want more than 200 hp if you know what I mean

For a 1989, your main problem is that the engine bay is a bit short for a V8 to just drop in. It can be done - Shelby shoe-horned a 318 in there - but you have to get rid of the mechanical fan and go between the condenser and radiator with a pusher.

A Magnum 5.2/5.9, with the wiring harnesses and ECU, will drop in with that caveat. Motor mounts swap if it's 2WD, transmission will bolt up (although you'll need the proper torque converter) and may even last a while. A later LA 318/360 (mid 80's on) will also, given that you may have more fits getting an ECU to work unless you roll your own or convert to completely non-computer (add a voltage regulator for the alternator, go points or stand alone electronic for the distributor.) Carbed or TBI'd will use the stock pump, fuel injected may take a different pump and regulator setup.

RwP

 

[RalphP]

Oh, I dunno - the local U-Pull-It sells engines (without the accessories on the front, though!) for $218 if you're a paid member. That's not bad.

Transmissions are $79. ECUs are $32, and wiring harnesses are $29 each (so, say three harnesses to get enough of the wiring). At that, I'm at $420 tax included - that fits within $500. Fluids will push over that, but he'll be ahead of the game even so.

RwP

 

[RalphP]

Cheapest and best upgrade to get you to 200+ HP? Drop in a 5.9L Magnum V8. You'll need the proper ECU for a 5.9L (the 5.2L ECU will also work if it's not the exact same), and to add the two extra injector wires.

You can also use the 5.2L (318) Magnum.

Try to get a motor out of a 1992 or 1993, those had slightly larger exhaust manifolds and for only 200HP, should do nicely. Supposedly, the 5.2 is 230HP (ref: http://www.allpar.com/trucks/dakota-1987.html ).

RwP