[nkaminar]

I second what Ed said.

It is really hard to diagnose issues over the internet. But it has to be either fuel or ignition. The plugs can be firing during idle but fail when the throttle is opened because of increased pressure. The spark has to overcome the increased pressure. If the compression numbers are good and no vacuum leaks, I would concentrate on the ignition first.

Try to borrow a known good distributor and coil. The symptoms sound like a bad condenser.

You can check the valve timing by bringing the engine to top dead center by using the timing pin then check to see if the valves in number 4 cylinder are off their seats by an equal amount. If they are then the cam timing is good. If not then the cam timing is bad. A fiber optic scope can be used to view the valves or a dental mirror and flash light. But do the ignition swap first.