I have a mild cam in a 289 per the builder. He's not sure which cam was chosen, so that's all I have to work with, lol. I'm very familiar with timing engine and have never had a problem. I let the car to 12* and let it warm up. I set the advance dial indicator to 36* and revved the car to 3200 rpm (blocked off vaccuum advance on the carb side). Set the timing to 0, but when I checked back to idle timing it was at 0*. I have a spectre distributor (old distributor cap had a crack in it, so warranty return.) It's a harbor freight timing light, so maybe it **** the bed on me. The last distributor landed somewhere around 12-16* of timing with 36* total. At 12-16* idle this distributor is way past the 40* mark on the balancer.