I have a Power Master starter on my 63 thats been on it since 2006 and has never given a problem. On all my other cars including the 400 in my sons Dart I use the Mopar starters. The one on my sons Dart is listed for the V/6 (3.9) truck eng and has been on it since 1997 and never had a problem. But I also agree with Doug & Gus as you have to test the system out and see what the problem is. The voltage drop test is a very good test for the starter system in finding bad cables or connections. I would also want to see what the battery does when this happens and what the starter draw is when it happens. Sure you can throw a starter at it and see what happens but the right thing to do is check the system out and find out what is causing your problem. I would also take all my test readings cold when the starter is working good and then when its acting up as that may help in diagnosing it. Good luck , Ron