Scott,
you have full/constant vacuum from the manifold,
therefore you have full advance.....all the time.
The 8BA engines took dizzy vacuum from the carburettor
at a point above the throttle butterfly's.
Vacuum/advance increased as the throttles opened.
8BA dizzies were vacuum advance only.
The first centrifugal/vacuum advance unit was the 1957 Y block.
Hope your Rochester has a vacuum take-off as per the Ford carbs.
Other options are a Mallory or a converted Chrysler dizzy I think.
Try Bill Bentley's excellent Flathead site for the conversion and
lots of interesting stuff.
http://www.btc-bci.com/~billben/flathead.htm
Its supposed to be winter here but we have temperatures
5 to 6 degrees above average...its like late summer!.
Brian NZ
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