here and idea: pull the crank damper off, have it index drilled for insertion of rare earth magnets, make a crank trigger pick up mounting bracket, cut off all but one of the reluctor teeth in the distributor. Now you have a crank signal and a cam signal. You could also just use a trigger wheel and a pick up.
I had partially done this on my 440 with XFI- I did not modify the distributor. I was testing the crank trigger to make sure it worked ok. It did not. The magnets i used were too small and would loose power when hot. I switched the wires back to the distributor for the crank signal for now. At some point I will put in larger magnets or add an aftermarket trigger wheel.
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