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That is good that you cleaned the connections up at the ignition coil. The connections and those nuts can sometimes loosen up and cause problems.

You need to pull out a spark plug and have either an assistant crank the motor over or use a remote starting switch with the fuel pump relay disconnected. Ground plug to the block and check to see if the spark is regular and of good quality.

I think though that your problem lies in the fuel system. The fuel hose for the tank pump can deteriorate and cause problems. Fill the tank above 3/4 and see if the problem still exists. You can though check the quality of the fuel system another way. Look at the photos below and there you will see how I made a port to check the pressure of my fuel system in my 264 - B23F conversion. Also see my post about Red Lobster:

http://www.brickboard.com/RWD/index.htm?id=1239230

After fabricating the port checking the pressure will reveal faults that are otherwise difficult to diagnose.

Another way to check the system is to use the fuel hose method. Put a propane source connected to a hose into the inlet for the airbox. If the situation improves then the fault is certainly in the fuel system. You can also use starting fluid or a gas soaked rag.

Good Luck!!!