1st Gen Crew Cab Engine

I would go with either the 440 or 360 with an a833 4 speed and some 3.73 gears so you can pull a freight train and still get decent mpg with lower maint cost. I have a 90 d250 with a z code 360 np435 4 speed and 4.10 gears. While I can tow a brick factory with it, I have no top end per say. If I had the money, I would have said setup listed at the top of my post