Joe, from my research a 14 bolt will work with modifications made. Frames on a 3/4 ton are narrower than 1/2 tons. As I recall, you will need to move the spring perches, make changes to the brake lines and emergency brake. There's plenty on info on this site to help you.

My truck was already modified when I got it. Already set up for sbc and had front and rear axles changed out to TF. I just went with a 700r4 trans and think I'll be alright on the highway with my 33" tires----yet to be determined.

Grigg is a great help!

~ Victor
1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery
1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD
1957 3100 - moved on
1959 C4500 Short Bus "Magic Bus" - moved on
1959 G3800 1 Ton Dually "Chief" - moved on
1958 C4400 Viking "Thor" ~ moved on to fellow Bolter