Hy Glen_P, your engine seems to be in good general condition by its compressin and vacuum readings. There are a few things that can cause the sporadick dip on the vacuum gauge, worn valve guides are one thing. I would go back through everything and make sure everything is set where it should be, points, timing, carb settings, just verify everything. Distributors can be worn, causing wierd simptoms as well, just check and adjust things to where they were designed to be, hope that helps.
