Currently running an 1800 Zetec on motorcycle carbs, runs well but due to the size of the engine bay I'm restricted to downdraft style carbs - these can get significant needle and seat wear so that mid range and top end fuelling becomes very erratic. (Even a known issue on some bikes as well) So thinking about replacing the setup with a single 32/36 Weber.
Anybody else running one of these on an 1800 Zetec? If so what jet sizes etc are you running? Also anyone got a decent Megajolt map for an 1800 Zetec as I'm simply running the base map (although it's pretty good on that anyway)
I have no room to fit standard injectors, throttle bodies dell orto's etc so other than down drafts or some very funky one off manifold to move positioning I am limited to the single carb option

Any help with a jetting starting point much appreciated.
Cheers