I think this carb needs to be replaced. I set timing, changed springs, made sure the curve was right. That is when I noticed none of the vacuum ports on the carb are progressive. They are all constant. A friend of mine had a bin full of carbs and asked if I wanted any of them. After looking through them I found a Holley 750 vac sec. I had it in my garage for about 6 years and when I started this project I took this carb and did a rebuild on it. Some thing may have been wrong with the carb before i got it. Another friend has a carb he is going to lend me to try out to make sure I am going in the right direction before i purchase a new one. As for the cam specs I do not know. I picked the motor up complete with everything except the carb(ie pulleys,belts,fan, starter, dist. wire and plugs) on a everything must go sale. There is no lash on the rockers so i am assuming it is hydraulic. I also am assuming it is one of the 520/540 lift hyd cams alot of people use. Because see sounds loppy. Also after setting the timing I tried to set the screws to max vac and at 800rpm I was a 5psi. and 1/4 turn was all I could get. Monday I am picking up the carb, then I will update.