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Re: 396 engine timing?
BBC's in general don't take (like) quite as much initial or total timing as SBCs.
6-10 degrees before TDC initial is fine as long as the total timing doesn't go beyond about 35-37.
(initial+centrifugal=total)
What I usually do is plug the vacuum advance hose then rev the engine to about 3000 RPMs and set my total at about 37 degrees. With 30 degrees of centrifugal, that means my initial is about 7 degrees. If you're running less centrifugal, then your initial will be a little higher than 7 by the same amount.
I mounted a timing tape on my harmonic balancer so I could tell where 37 degrees was, but you can do the same with an adjustable advance timing light (set it on 37 then time it until the marks line up i.e. = zero advance).
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