Ah ok, get you now, so you need to lock the dizzy to give an un-changing TDC reference for the ECU?
What I meant with the throttle body is: the 4ke has a throttle body the size of a 50c piece, and hence the opening to the plenum behind it wouldn't be much bigger. The VN one would be more like a tennis ball. So once air has passed throught the tennis ball sized TB, it then has the same restriction of the 50c piece plenum opening.