Thanks for the replies all,
I will be replacing the fuel filter before looking further into the carb build as when i use a fuel system cleaner it seems to work fine for a while.
I will look into carbtech @ redcliffe Reubs as thats not to far away from me, or i might just get a rebuild kit and a workshop manual and try it myself, as I have played around with a few carter thermoquads and 4bbl rochesters in my earlier years but that was over 20 years ago now
cheers
Pete