I have a 427" SBF, MSD crank trigger with matching distributer and a 7530T box. When I initially got everything set up I used a piston stop and degree wheel to find TDC, moved the timing pointer to reflect TDC on the balancer, rotated the motor over to 34 degrees (where I wanted to start out at), and centered the pipckup over the closest magnet on the wheel. I did this with the engine in the car, so getting the pickup/magnet centered was as close as I could get it becasue I could not look directly at it due to the radiater. Started the motor for the first time this weekend, put a timing light on it and it was at 30 degrees. Pulled the mandrell off the crank, adjusted the pickup again with everything lined up at 34 degrees and got 31 degrees this time. Any reason why I am not getting what I am setting this up at - 34 degrees (thinking if I am looking down at it I may not be actually centering it, could this account for the 3 degree difference)? Can I simply start the engine, loosen the pickup, put a timing light on it and adjsut the pick up till I am showing 34 on the balancer with the light?