..would I be insane to mate the 350 wiht the 3spd tranny, provided I swap the rears to 3:7.3s??[/QB][/QUOTE]

Hi Tom, I thought that I would let you know that the 350/3 speed combo works fine in my '66 stepside. It is a bit on the low speed side but it will really light up a tire. I am going to put in a 4 speed or late model overdrive 5 speed this winter. Good luck with your truck.

If at first you don't succeed, you are about average.