It's pretty hard to recommend anything when you're being so general and vague with your answers.

If it runs okay on gas, i.e. idles and revs, then it sounds like a petrol delivery problem, particularly if it takes a few cranks and then fires on gas, as they're usually a petrol start.
If you earth the top right most pin of the diagnosis connector, select 'petrol', and turn the ignition on, the fuel pump should run continuously, while the engine is off.
If the balancer mark is sitting at 12 o'clock when timing checked, I'd think most likely you haven't gone through the correct base timing procedure. Still, this shouldn't stop it even kicking on petrol.

I would backtrack and recheck everything you've moved/disturbed, etc, including adjacent areas - already done that, well do it again.

Also recheck your timing chain setup if you're still doubtful about it.

i forgot to post that i got it running on petrol on tuesday some idot labled the fuel lines wrong and put them round the wrong bloody way, all good now . when i tryed to do the base timing and put the comp into self test mode the idle speed only increased to about 1000RPM the book says that it should be around 1500RPM would this count as a problem

might have found the problem no.5 is not firing so i need to get a hold of another coilpak and see if it fixes that issue.it has a full new set of plugs and leads

put a new coilpak in tonight and that fixed the problem so thanks to all the people who have answered my stupid questions over the past seven months. its taken awhile to fix a head gasket but thats how the money flows, thanks again to all