OK, so I built a semi race motor it is a 355 with 10.5 to 1, trick flow super 23 heads, victor jr, comp cam xe284h, 750 demon carb, msd ignition 1 3/4 headers backed by a th350 with a 4000 stall and 4.10 gears in a sub 3000 pound car and a set of drag radials 26/8/15. See my issue is that the car has ran a 12.8 at 110 but I feel that the car should be in the 11's so I have been trying to figure out what Im doing wrong when I came across this, My balancer I thought had the mark at Zero then I was reading some things about timing and summit list this "TDC mark is located 10 degrees from keyway". Does this mean that my timing has been off by 10 degree the hole time or does this just mean that the keyway is cut at 10 degrees. I am just useing a mr gasket timing tab. It kinda makes since, but I want to get another opinion and do you think another 10 dergrees of timming could make up the ground I think Im missing on my 1/4 mile times.