I'd think the 3.08 would be a good swap if the width is right. It should easily move a half ton load. The only problem I see is 5 lug wheels. However if you are putting discs on the front they are available with 5 lug.

"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.