[elhigh]

That high-top isn't doing you any favors when you're driving; it's only when you're parked and moving around inside that it is any use. If you expect to mostly use the van for going places, then consider switching it to a lower-height, smoother model, preferably one with a nice, long taper to the rear.

Look really hard at changing your axle ratio. If you're not a speed demon and willing to drive conservatively - and being here suggests you are - and don't do any towing, you could switch out to a pretty tall final ratio and really slow the engine down. Barring that, it shouldn't be too hard to find a somewhat less prehistoric 4-spd auto that'll hook up to your 305. One with a lockup torque converter if you can find it.

What part of KY? Did you go to the Farm Machinery Show?