ah right so the rs1600i uses a dizzy, well just have a vacuum line going from one of the inlets on the manifold to the dizzy. ive never done this before as i done it on my zetec which has a coil pack.

but im sure youll need the vacuum hose there to advance the spark at higher rpm.

just buy some carbs, get them on a manifold and bung them on and turn the key see what happens

oh and if you go to bogg bros its 175+vat for the manifold alone, they know what there doing though!