where to get weber ict 34's manifolds

shouldn't be an engine out job, Try VW speed shop ^top of page or VW hertitage/SSP. Easy to put in, a little more work to get setup properly. Check they are jetted correctly too.

Probably worth taking to someone who can tune and balance them up nicely for you. Have you got a linkage for the throttles?

Ado

Cheers for that Ado, basically - bought the carbs (including type 4 manifolds) for a type 4 lump I'm working on over the winter months but in the meantime will try them on my 1600tp. they have a linkage but its a t4 linkage so will adapt it to fit. Should only need changing length of hex bar I reckon.