My truck is a 1986 GMC. It has a 454 and a 4 speed and has been running on propane since January 1991. I converted it back to gasoline in the fall of 2011. It's also got some other nice features like power windows/locks, a/c and tilt steering.
Considering the area I live in, the truck was in pretty good shape for it's age. It also only had 130k km's on it when I bought it.
This is how it looked the day I drove it home:
And shortly after cleaning it up and putting it back to gas:
And this is in the body shop this summer:
I wanted to get it repainted now before the rust got out of hand. The frame and underside of the cab were both in great shape too.