whats the compression. after i refitted the head on my mums 206, it took about 1 hour of solid cranking for the pressure to build back up from 8 Bar to 14 Bar. make sure the injectors are firing properly - take them out and point them into a bucket and watch them fire.
double check the timing is 100%, its easy to be a tooth out when tensioning, although it should start, other culmulitive factors may have a funny effect.