I just started using the limiter plate this year, so far so good. I'm building two mopar distributors so I bought the full kit the first time, it comes with a curve sheet for the springs. The second one I bought I just got the plate and springs. For the price and the "adjustability I think they worth the money. However, read on...
I found the numbers stamped on the plate that indicate 0-10-12-14-16 or 18 degrees of mechanical timing are not exactly correct. It may be a difference of tolerance of the factory distributors, or not. I did measure the slots on the limiter plate and compared them to the "weld and file method" measurements and they are different. To get 14 degrees of mechanical I had to use the slot labeled 12, and actually the 12 slot measures 0.352 which is really close to the 0.355 that the weld and file method calls for if you need 14 degrees. I found the same problem with the 16 slot (measures 0.395), it actually gave about 19 degrees. Again, I still believe these parts are worth the cost, just know that you may want to verify your actual mechanical timing and not trust the number stamped on the plate.
