A buddy of mine has a very nice bone stock 66 289 4v. The broblem is under load it feels like it is loaded up realy bad. Its like hopping on a cold 2 stroke dirt bike. Idles perfect at 700 and reves nicly to 5k sitting in the parking lot, but as soon as he gets on it its a dog and sounds terrable. I put one of my extra holly carbs on there and it did the same thing. I reset his points and timing and still nodda. He just bought some plug wiers and we are going to put them on tomarrow. Any idiea.