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I've heard that the crane optical pickup works the best...
But I've used compufire in my Type I and seems to work well but I haven't done any dyno testing...
i have the mallory unilite and its phenominal. i have the old jacobs bugpack on my bug and that thing is awsome. on my notch i had an msd 6al before it decided to stop working. i guess i have a bad taste in my mouth now. im thinking of getting the mallory hyfire IV for the notch now. o doubt i will ever use the boost retard but the start retard function is nice and it has the digital display so no knobs to break or turn on their own free will. for the money the mallory is definately the best. it doesn't have the hottest spark but i think for a street motor, after a certain point you dont need anymore spark energy to fire the fuel. just my thoughts.
Is it possible to retrofit an optical pickup setup into an older mallory or do you need a new dist. I have a few old mallories in the garage collecting dust. I strongly suspect the answer is no, but it never hurts to ask.