53 flathead. Trying to figure out a timing issue. When purchased the engine was partially tore down (heads removed, carb off, and generator removed). Everything is reassembled and now we are troubleshooting what appears to be a timing issue. Setting the timing by the book leaves the car backfiring through the exhaust and sometimes the carb. Reset the pulley at TDC, pulled the distributor up, turned the rotor 180 degrees, and dropped it back in the hole. No more backfiring but no signs of wanting to start. Which why is closer to the truth? Any tips on finding actual TDC with the head still on the engine?