Not a 406 owner but it's still a sbc. Just a couple of questions...
So you power timing it instead.
At what rpm are you flashing the light on it, to get the 1/2" off the tab? That's if you are going by the tab. Is the harmonic balancer degreed/indexed or at least have timing tape? Is there an advance kit in the distributor with an adjustable vacuum advance?
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John
1984 C30 Chevy Crew Cab Dually
1998 Jeep Cherokee 4x4
2004 Chevy Trailblazer 4x4 (wife's)
1970 Mustang FB fully tubed (getting 521 BBF & powerglide)
1978 Nova 2dr (going BBCaddy & S.P. th400)
1984 Monte SS (circle track car)
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