i got it running like a dream now, the problem turned out to be the bloody plug leads!!!
lesson number one...do not buy cheap plug leads of ebay
i noticed that there was signs of arcing the dizzy cap. the cap was brand new so i guessed it was the leads.
i got some new leads from my local auto factor and it started first turn of the key, a quick check of the timing and a tweak of the mixture screw and it is running perfect. the rumble has gone and it revs from tick over to beyond the red line with no missfires.
i was in such a good mood i treated the missus and kids to takeaway.
got friday off..time to start on the brakes