I want to get my engine timing dialed in. I discovered when I was having a fiasco with the ignition system, that if I disconnected the vacuum advance I got a dramatic boost in performance. I knew something was off, because I order to get maximum acceleration I had to give about 2/3rds throttle. If I gave it anymore, it would go slower. I checked the timing with it connected, and as soon as I nudged the throttle, it would jump to 40 degrees. I replaced the vacuum advance with an adjustable one and it no longer does this. Right now I get maximum acceleration when the throttle is about an inch from the floor. The initial advance is set to 12 and the total advance goes out to 48 degrees. I'm guessing this might be too much. The distributor is currently using the 18L reluctor arm. I was wondering what the total advance should be set to? I've only been able to find total timing suggestions for compression ratios from 9:1 to 11:1. The compression tester is giving me a reading of 120psi, so it should be around an 8:1 compression ratio if I got that right. I don't have any detailed specs on this engine. My dad bought a Ford truck 302 short block from an engine builder. The things I do know is it has a high torque flat tappet cam of some sort. The intake manifold is from a 83 Mustang, and the heads are from a 86 Mustang. It also has a Holley 570 Street Avenger carburetor.