Before I dropped the tank I'd take a line off of the carb and turn the pump on to see how much gasoline I got!!
I would also put a light on the timing and run the engine up slowly to 3 grand to see ehat the timing was doing.. Your miss could also be a coil or sparkbox.. In olden days misses like you describe were most times a condensor and we replaced the points AND the condensor.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist