Take a step back and double check the easy stuff.
Is the sparkplug firing order right?
Are the spark plug wires new?
Are you capping the vacuum line when you check the timing?
Confirm the distributor centrifugal weights are working, when you rev the engine does the timing mark advance while aiming the timing light on it?
Condensers can be bad right out of the box...replace it and see if anything changes.
Mike B
