3&6 missing, stalling when put in gear

I'm going to try the balance test next, but ran out of time this morning... was scheduled to start work at noon... just enough time to get started but not finish a project :-P
I'm going to throw another wrench into the proverbial works here and mention that this issue has happened before. Same symptoms, ect. However, at the time I had gathered a bunch of new parts to put on; oil pump, intake/exhaust gasket, valve cover gasket, oil pan gasket, coil, cap, rotor, plugs, wires, points... damn near everything I could replace in a weekend since it had a bunch of old bits that came with the engine when I bought it. It went away. Now it's back, a little at first and getting progressively worse. Last time everything I did seemed to make it a *little* better, but no one thing seemed to solve the issue alone. I'm gonna set aside this weekend to work on it with another wrenching buddy over and see if we can figure it out.