283's don't mind revs, but even with an OD trans you're going to need a much better ratio rear than a stock 3/4T has to run 70 for any length of time

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics