ok i put an msd blaster 2 coil on about 2 months ago before my rebiuld and it would not run without a ballast resistor

sounds normal right

well after i rebiult my engine it had to bypass the resistor and now she will run

any thoughts on this

is there something wrong or what

Remind us what kind of ignition you're running. Chrysler electronic, GM HEI, something else?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

i am using the stock 74 chrystler electronic ignition also have not yet upgraded to the oragne box so i dont know what would be going on?

There isn't that much difference between the stock and orange Mopar box, and the metal can MSD coil isn't all that different from a stock coil. I've run an MSD can-type coil for years with a stock (Ford) electronic ignition w/o any problem.

I have seen brand new coils that just were plain defective and wouldn't make a good spark or would arc inside and fry ignition boxes in short order.