The distributor has given smoother acceleration with a few more revs up top.I have advanced the vacum advance a total of 4% since it has been installed.2% 2 diff times.The more I advance.The better she runs.Going to creep up to ping.Then back down the vacum advance.For the price for a new distributor and change in performance.Performance curve kit,module,coil.I'm glad I did the plug and play.