Guess who's back

From what you described it sounds like a vacuum leak. So you need to explain what you have done as far as troubleshooting. You say your sure that the carb is good, no vacuum leak and nice clean fuel coming from fuel tank. You need to pull plugs a look at them as far as color or fouled. If plugs look good run a compression test or leak down test. You need to make sure that you didn't cross plug wires and look at cap and rotor and air gap of pick up. What is timing set at and are you checking it with vacuum advanced disconnected? Have you made sure timing mark on damper is correct. Have you looked to see if all valves are open and closing and looked the cam over when you had intake off? This is basic trouble shooting that needs to be done. You need to give details just what you have checked so we can give you solid advice. I hate to tell you to start pulling your engine apart for no reason. Bill