would 73-87 rear 3/4t or 1t leaves ride horribly in my 70k20?

[rickcdewitt]

hey guys i'm trying to decide how to beef up the carrying capacity on my 70 k20 project truck and am leaning toward some 73-87 3/4 or 1 ton leaves and moving the rear hanger back 4 inches.

i'm assuming my truck is lighter and don't want it to bounce all over but i like the idea of 1 ton springs for towing a car hauler.i don't care to much about a smooth ride but i do want it to keep traction in 2wd going uphill on a steep dirt road since there are a lot of them around here.

can anyone with one of these later trucks comment on the ride or somebody that knows frames advise on if the 1 ton springs might hold a dangerous amount of weight?

i do want 56" springs of some kind but i'm unsure of which ones would be approriate. thanks,rick