I have been having a few issues with my engine for awhile now. I recently put on a rebuilt carb and that seemed to help out a lot although there are still some problems. The idle seems to surge a little when it warms up. The engine also shook for awhile when I first started it.

Compression is good. I checked for vacuum leaks and couldnt find any unless there is one under the intake manifold or in the distributor.

The car was sitting for 20 years. I was having a difficult time adjusting the valves since the rockers did not have a completely smooth surface to the tips. I also had a feeling the hydraulic lifters might have been seized up a bit. Could that cause this problem? Would replacing the lifters, rockers, and cleaning up the intake manifold with new gaskets fix this? Any other suggestions?