Contemplating Purchase

[Low84]

Well I was driving out of work in a residential (kinda) road behind two semi's and a retirement home van.......SLOW. Anyway, long story short I had enough time to look around and spotted this yesterday:



Looks solid! Owner wants $2000 I offered $1300

It's an 81 gmc, double tank truck with the 350 in it. It's a recently brought down (driving) California truck and super solid!! 99% rust free.

Now the thing that kinda made me double think things is the owner mentioned the truck was setup to run on butane. I've seen it before but does anybody know what effect it has on the engine?

The truck starts right away but the idle sounds odd, and the owner said the truck hesitates/bogs a bit when you lean on it. He claimed the carb got thrown off tune because of the butane.

Anybody know the effects of running butane? Is that a factory color? And how much would you pay for it?