I had the same problem, after a rebore and complete rebuild. In the end I found it was flooding, and ended up controling the fuel by taking the fuel pump fuse out and in and out and in at the right time, until it fired. It took me about a week of killing batterys to get it fired mind. Yes you can get the dizzy 180 out with no1 at TDC but like someone has said if both valves are closed on no1 then its right. Oh nice job on the engine.