Have 2 Ignitions, which one is BEST.
i personaly use the Mallory 685 box... it has more bells and whistles then i cold ever use..
Use the MSD 6BTM for blower application. Its got the same guts/power as the 6AL but with the additional boost retard function. It will pull timing per pound of boost. It is adjustable, 0° per pound of boost to 3° per pound (up to 15°).
Hope that helps-
MSD Ignition
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