Pull the coil to distributor wire from the distributor cap and hold it (with insulated gloves or some protection) about 1/2" from the cap and turn the engine over. If you're getting a good output you might check the same connections at the plug wires to the cap and also at the wire to plug connections. I used to place an extra plug on the block and watch for spark.
If you get good fire all the way down to the plugs, pull them and check the gap or if they're fouled.
Working your way down should help point you to the culprit.
I bet a guru will chime in for you soon with some great advice.
Mine is merely shade-tree 101!
Good luck to you.
Jerry
