Bigger tires? I run 9.00 x 16 (36") on my powerwagon. My rpm's are around 2000.

I would think a mid 90's dodge 5 speed would be cheapest. Not sure if it would bolt to your bell, and I think the 5 speeds use a hydraulic bell. If you are going to use the dodge computer, the crank position wheel is machined in the back of the flywheel, so you will need a 5.2 flywheel.