Old, used carbs are a dice game. I will not invest more than some time, a good carb cleaner soak/scrub, and the cost of a rebuild kit in ANY old carb. I learned my lesson with remanufactured carbs (rebuilt just like you would at home, just “painted up” to make them appear new) and even professional carb restorations (complete with rebushing and “the works”) are, in my experience, a big crap shoot! I once spent over $300.00 having a carb restored … twice … only for it to end up in a parts box and replaced with a good used carb that cost $25.00. I would honesty take my chances with a new, “China” carb with a guarantee than to spend money restoring an old, poor running or condition unknown carb. If your determined to have a carb restored, do yourself a favor first. Soak the carb out and rebuild it with a kit first, install it, and see how it works. If it runs great, either live with it or then send it out to a known quality carb restoration guy. If its a dud, look for a better core, soak it and transfer the carb kit over and try it until you find a winner BEFORE sending it out for a resto. A 30 plus year old carb has endured a huge amount of heat cycling though its life. These things are aluminum, old aluminum at that (the technology of metal manufacturing has improved vastly over the decades; provided that a new carb has been cast from quality metal stock). These old carbs will warp over time and after extreme heat (if a carb has ever been on fire, even for a minute, it’s toast and only fit for the trash can). Yes, some will argue and defend their carb resto guy and I will not argue that some are better than others, but unless the resto comes will a trustworthy complete one year satisfaction guaranteed, money back, we will pay all the shipping to try to make it right warrantee, I wouldn’t touch a resto on a known bad or untested carb with a 50-foot-pole!