I went to the carbed ford message board and the corral and so far I've got about a dozen people that say the same as I do and I've even got a test for ya. Hook your vacuum guage up to the spark port with a T and go for a drive. 0 at idle, goes up cruising at 2000 and a little more as you go up in cruise rpm. Put the throttle down a bit and the vacuum will drop to 3-4" meaning it's dropped some of the advance, go to WOT and it's at about 1", go ahead and try it.
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