Just curious if the stock carb in the 2f engine is a fixed or variable venturi, or neither. I acquired a Toyota carburetor technician's handbook and it has quite a lot of useful information pertaining to carbs, however it only focuses on those two types. It states nothing about vehicle type and the publication date is 1987. I would like to know which of the two areas I should be looking at. If anyone can chime in with an answer, I would appreciate it.