JUst wondering what dates its on this year??

just a quickie on the fuel line subject
the original lines were copper, but what diameter?
IM running twin carbies, is there any advantage of using a fuel block/rail or would using the direct line into the carby sufficient?

thanks for the help guys. i picked up a waggot twin carby manifold a few years back, and just satrted to put it together, its really well made with the linkages being made out of alloy, not the dodgey speco items that you get from rares.
might try to get in touch with the guys out there and see if they know anything about it.
thanks again!!