Need some help. I've finished the install and the first start went okay until I had to verify timing and had no degree wheel on the harmonic balancer. The engine ran but was very hot so most likely too much advance. Car overheated pretty bad so I took a break and have started again after fixing all the cooling issues. Olds 455 with dual synch distributor. We used the one deg reference angle method the first start and all the subsequent ones. Have not been able to get it to restart at all. Most I get is a big backfire through the carb module which tells me the dist is off so we redo the entire procedure in the install instructions and end up with the same result. We get TDC on #1 cyl. Verify rotor is pointing to #1 on dist cap. Instruction say rotate rotor to point towards rear of engine and since this is a GM we point it towards the rear of the car. Turn key on and rotate dist body clockwise in until I get a light which I am assuming is the cam signal. Continue rotating clockwise until I get a second light which should be the crank signal. Find the leading edge of this signal and tighten. Put cap back on, hook up neg coil wire and start calibration/start procedure. Everything goes fine until you turn the key and only get cranking back and then the backfire. After six times we tried the 30 degree method and got the same result. Fuel pressure is good. I'm now at the point where I am no longer confident the dist is in the right position since it has been rotated so many times. Anyone have any ideas? I would hate to backwards to the carb but am losing confidence in myself and the product.