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Belaid response to Ron and Bill
Ron,
I feel for you on the distributor deal. I have done a little of this myself and after a while it wears real thin. You must have patience beyond belief (mind I suspected that when I was over visiting a few years ago).
Bill,
I have not experienced the problem you speak of but I think I can see a possible situation along the lines you describe contributing to the end reult. First an advance of 45 degrees at criuse with say 8-10 inches of vacuum is not by any means unreasonable. That is about where I would expect the timing to be. I have had engines that required as much as 52 degrees to get the job of best mileage at criuse done.
That said the miss could be that when the timing is right and the throttle is further closed the carb goes onto a part of the tranfer circuit that is leaner (needs slightly bigger idle jets). This might well be the case if the carb had 4 corner idle. When that happens the system goes into a lean mis-fire.
In addition to that you might want to check that the plugs may need a bigger gap. The amount of spark energy deliverd to the gap drops as the gap gets smaller or the vacuum goes up. Try a 0.055 gap.
Let's here how this fits in with your further thoughts on the subject.
DV
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