Has anyone ever converted a Cardone 84-2698 to a 30-2691? Looks like you would add a vacuum advance and add Pertronix 1261 electronics to it.
Cardone says the 30-2691 is not obsolete - I replied that if you can't find one it might as well be.
Never tried it. I did look at a 2.9 TFI distributor, the shaft size was different. If the shaft size of the 84-2698 was the same as the 30-2691, it may have possibilities. If you look at the guts of both of the distributors you listed, they are totally different. I don't know why they call the distributor listed on Amazon a "HEI" distributor. HEI is a GM term. That is a Ford TFI distributor that came stock on the 2.8 and the 2.9 in the 1980's. The duraspark has the little start wheel and a different pickup. The TFI has a large wheel with square teeth on it and a different pickup. The duraspark generates a A/C sine wave signal while the TFI generates a square wave signal. But if you could get the shaft to fit, you may be able to modify everything else to fit.
I have both of these distributors, the wore out older Mustang II distributor and I am now running the TFI with locked timing. I just checked my mileage yesterday. I don't get as good fuel mileage in the winter. But as expected, with the locked timing I am only getting 16 mpg gallon on my first mpg check. I am going to check it again, but I was getting 20 mpg. If I drive it very long losing 4 mpg, it won't take long to pay for something else to get adjustable timing back. I keep going back to this thing here.
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Reason is, I have been toying with the idea of converting a 2.9 I have to carb. The above would allow me to do that if I ever decided to.