I just had my 302 rebuilt, and I just set the timing to. While I worked on the car I noticed that car car was running to rich on fuel so i adjusted it. I ran it and it ran smooth without any hesitation, and sounded to smooth. I turned of the car and and tunred off normally, for the next 4 times it did. But later on the car started to pre-ignite. Once i turned off the car it, the engine continued to turn and shut off. I dont know what else to look into, and was wondering if anyone has found a way to find or fix the problem. Thank you!!!