Dakota V6 to V8 swap

Thinking of droping in a V8 (5.2 or 5.9) into my daily driver. '95 Dakota two wheel drive, ext. cab short bed. This is utility only, I do pull a couple of motorcycle trailers with it. MPG important but torque is the main goal. It is 3.9 mag with auto. 185,000 and runs great but when the time comes I can rebuild the 3.9, or drop in a V8. Thinking about one of the following .030 over V8's. 318 +.030 over, stock stroke (322). 318 + .030 with 3.58 stroke (349 cid), or 4.00 (390 cid). 360 + .030 over (365 cid). Don't believe I would stroke the 360, it would be enough the way it is. I already have an LA 318 and a couple of LA 360's complete on hand. If a Mag would be easier I would have to go get one. I believe the mounts are the same with the mag engines. I know the front springs will have to be replaced with the V8 engine, they are different part numbers. I am sure one of you out there have done this or seen it done . Any input is helpful and thanks.

Terry