Thanks for all of the input gentlemen, you have given me much to think on.

I dont want to go fast, as much as I want to go quietly (lowering engine rpm at speed). About ten years ago I crossed the country in a stock 67 vw split window mocrobus. It had about 10 to 1 reduction gears, and the top end was about 58mph with the engine about to fly apart. While it was a fun adventure, I am not in a hurry to repeat the experience.

The other reality is that this part of Florida is Rural, and it is a long way to or from anywhere. I want to build the truck for the environment, so a higher gear makes sense for...

RPM at speed
MPG
Noise at speed
Engine wear.

I was thinking a late model (92-96) Caprice/Impala for a donor rear end. Okay, I have to convert to five lug, but in the long run that might not be such a minus. I will be using the truck for light duty hauling (home depot for the wife and such)but mostly it is going to be lightly loaded, so I figure I can get by with the taller gear ratio. Again, thanks for the advice and information