Need help "De-hotrodding" my truck

[crawdad]

Hi folks. I just aquired my young teenage nephew's '86 SWB truck that he had bought about a year ago. Well, he wound up having a 4-bolt main 350 built for it with a radical cam, headers, etc. I don't know all of the stuff that went into it, but it was all high performance stuff. He's suppose to get with the builder and get a list of everything so that I'll know what I got. The thing is an absolute gas hog, and the cam is so wild, it lopes and vibrates everything in the cab. It became too much for him to buy gas for and finish up the things that remain to be taken care of (paint, etc.), so I took it off his hands. I am wanting to "de-tune" or "de-hotrod" this thing so that I can make a more decent daily driver out of it and get the gas miledge up. I would like to get your advice on how to do this and spend the least amount of money. I think it has a Rochester Quadrajet carb in it, and I know it is not running right as I think I can smell an overly rich mixture on it. Other than trying to get the carb right, how would you go about dealing with the rest of the stuff to make this beast more driver friendly? Thanks for any advice.