WIW- stock 79 suspension

[Blue_71]

ive not messed with these much-- but a guy at work wants to trade me his used 6" front lift springs, 4" rear blocks, and lifted steering arm for the stock 3 leaf 1/2 ton front springs, and steering arm off my 79. i figure his lift kit is worth $100-150 as is, but i need to know what stock 79 3 leaf-leaf springs are worth..

the kicker to the deal is, i have to do the swap. he's an auto-body painter and hates mechanical work. the bad to doing it, is the 79 is my wood hauling/farm truck, so thats just 6" higher i have to throw everything that goes in the bed. of course, that is 6" more crap i can run over without hitting the frame too