I'm the 'Geoff' that Frank referred to. The aftermarket p/up coil had a noticably bigger air gap between the reluctor teeth & pole piece than did the stock piece. My guess is the gap is upwards of 0.015" & could be as large as 0.025"; hard to measure without brass feeler gauges. This aftermarket p/up coil produced a great spark on the bench because spinning the dist shaft by hand generateed a higher voltage than when cranking more slowly in the car; in the car, the output from this pick up was too low. I compared both p/ups on the bench by spinning the dist shafts by hand & measuring the output at the p/up wires. The stock p/up generated about 100 mv & the aftermarket one generated only 30-40 mv; both measured around 770-780 ohms. I think Frank also has a couple of other problems that have aggravated this problem. His battery voltage was low when we started, about 12.38v, usually a sign that a battery is past it's peak; also, I think his starter may need a rebuild because it seemed to me to crank slow, even with a booster connected. At the end, we had it firing, but not starting, & I believe he now has a Holleyitis problem. The Holley has no choke, but fires when you pump the pedal; so it appears the engine uses up the pump shot to fire, but there is no idle or main circuit to maintain running. We'll get there.
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