I dont know if this helps or not, but here goes....
Are you sure that the erratic timing is not a misfire? I dont what type of ign box you are using with your Fast, but I do know that many of the digital boxes will just not work correctly (without a random misfire) using a distributor pickup, they will only have a clean signal with a crank trigger pickup. A misfire would also explain your breakage problem. I run the FAST and BIG STUFF 3 on several of our blower and turbo outlaw cars, and while I am no expert, I have had my share of problems and broken parts----trust me, if it cant be broken, I have already torn up a dozen of them.
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