I got tired of rebuilding them all the time to keep them to running good. Friends raced Super Stock and Stock, kinda opened my mind what was possible. I stopped reading magazines and started listening. A friend was racing a 396 in a late 60's Chevelle 4 speed and was using a 850 DP Holley. He was running real slow times, so I asked him if he had the original Quadrajet. He did, so I spent a day doing it up right. Next race day we went to the track and he had so much low end power he shredded the clutch right off the line, first run. Well, he blamed me and the Quadrajet and put the stupid Holley back on. He continued to run slow. I'm not saying a Holley won't run good or make more power, but for me, they are not worth the aggravation for little to no gain. Thermo-Quads are amazing.