Timing curve for my big-cam 451?

Kendog 170 said

I believe there's a # on the vac can arm which relates to what vacuum will pull it in.I can't find the article I read . I'm not an expert but you may want to see what # you have and go with the lowest # available.Some thing you may not have considered. Also (I think you may have already done this) Turning to screw CW in the advance all the way in should make it react at 5 inches of vacuum.

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The number on the arm is the max advance in distributor degrees, i.e. half the crank degrees. So a "9L" can will advance 18 degrees when fully in. At least for Mopar cans.

I've heard (from other reputable sources) that screwing in the adjustment to the stop should also start it moving at 5"... but this one definitely does not! Maybe it's defective, or maybe they don't all work that way? Anyhow a new stock can is $25-30... I'll talk to FBO and get the specs on theirs before shelling out $69 plus shipping.