Thanks for all the info guyz.
Well I got my guy to look at it today, he could find any fault out of the engine

he recons that before the engine was a bit retarded and when I had the new distibutor fitted and the tuning was set right it showed up this problem. he recons it is probably the seals

So, if I am getting them done I recon I should get a complete recon done, as the car has done 182000 (was planning this for next year, but what the hell). anything else I could get done when it is in this state?
Also how much is it to have a recon done, my guy is pricing parts this week and will let me know, but I would like a rough honest price off you guyz first, just to see if it tallys up!