Is the accel pump shot working when you give it gas? Should dump gas immediately. If not, that's your problem. Those are big carbs for a 1776, which is a relatively small VW motor. When you hit the gas, that is a lot of air being dumped in. Need lots of gas to compensate. Look for play in the linkage, shouldn't be any.
On a side note and in my opinion, I wouldn't mess with VW's anymore. Not since engines like the Ecotec can be had fully equipped for less than the price of any quality VW stroker motor. About 160 hp all day, reliable, parts availability, no adjustments all the time, turbo options. The only reason my Manx still runs a VW is because it hasn't died yet. I don't beat it up either. Nowadays, VW engines are for purists and old schoolers. They are not cheap anymore and replacement parts are junk.