I'd go with the 302 just for the "cool" factor. These are the engines that were blowing flathead Fords and 265 Chevies out of the water back in the day.

There are some mods that the military 302 will need. There is a great article on this at the OldGMCtrucks.com forums.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.