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Verify the timing marks on the dampener and timing cover to make sure that TDC on the dampener is zero on the timing tab on the timing cover and go from there Let us know what you find I have a B motor in the shop now that a customer was running(it didn't run very well) that has a early straight tab timing cover with a later model stock dampener, that combination throws the actual timing of by over ten degrees, if you use the zero mark on the timing cover tab

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My last build a buddy helped me by notching the timing tab at true TDC. Needlees to say it was a tad off.

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Also, does any one have pictures of early timing tab covers and newer ones?
I believe I have the correct one, but you never know.

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The early BB timing covers, pre 1966 or 1967, (I can't remember the change over year, I'm a gear head so I can't remember details like that ) have the timing tabs straight with the zero indicator on the top. The later(smog) ones are curved and have the zero mark in the center of the curve with timing marks above and below the zero hole
Not hard to tell the differences once you know what they are I hope this pictures is clear enough to see the differences between the tabs

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looking at the engine from the front of the car, the timing tab is on the left hand side. I've never seen a right side timing tab cover before.

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