one distributor degree is .0154" of travel. very easy to verify with number drills. the FBO pates I have are using .010" of travel for each distributor degree. so, the numbers on the FBO plates I have don't match up with the mopar stuff. can you still use the plate? sure, just verify with the number drills what the travel is and having a timing tape or degrees marked on the dampner can get you where you need to be. to me the FBO plates are an unnecessary hassle compared with modifying a stock plate.