I built my motor 347 with the best of the best eagle internals,brodix heads, custom comp cam, edelbrock intake.... msd everything.well on the dyno it did great but at the track i kept falling on my face.well everyone i talked tosaid change the distributor and i did last night i put the factory one back in. well it fixed the problem.when i pulled out the msd the piece inside that the pick up on 2 of the spots it senses had distorted and bent out to where it was rubbing on the pick up and everything else inside the distributor.Everyone i have talked to says that with a fuel injected motor msd doesnt have it right yet so my advice is dont buy it.