Did that on a Mark 20 that needed $100 worth of new Bendix coils. Thought I would just try it, since I had a pair of good coils from a motorcycle. Ran fine off of a rechargeable 12 V battery. Did not check dwell, but, as you say it was probably way too much. Only ran it a few hours but it is a viable solution where it’s a matter of any port in a storm. Motor is still on the shelf, waiting,,, 😉
