I got the Distributor back in by lining TDC on the balancer (I couldn't ensure I was on compression and figured I'd just spin the distrib 180 degrees if it wouldn't start), dropped the distributor in so the rotor lines up with the number 6 tab on the housing when its seated in the oil pump shaft. Engines started but ran rough,. popping and missing and even a little knocking. Set the distrib back (retarded) 1 tooth, no start. Tried advancing 1 tooth from where I started, no start. I now have it set back to where I started, running but missing and popping. Suggestions? If I'm 180 degrees out on the distributor would it start at all?