I was hoping someone might be able to help me figure out whats going on with my car. I have a fresh 289 with a new holley 650. The ignition system (something I know little about) is a m id seventies factory system. I have had problems with the car loosing power in the past at high rpms. It also seems to pop and backfire at high rpms. I have checked the timing and it seems to be on. I have also adjusted carb and it seems ok. I have changed the electrical box for the ignition in the past and that seems to fix the problem but only temporarily. I have not tried doing this since the new engine. I was wondering if this could be an ignition related problem or not. I should also mention that this is a sixty five car.