The thing is, if there was a problem with the internal parts, it would have been damaged within the first 250 miles...but it wasn't. The damage occured after recurving...in the 150 miles after installation. Which means either:
1. Pre-Tuner did something "different" when reinstalling the distributor, OR
2. The people who did the recurving did something to change the position of the dist. gear.
I vote for #2. If the metal tangs weren't sheared off when the dist. was first removed, it's safe to assume all the internal engine parts are correct.