My 292 currently has a holley 600 vac. 4bbl mounted sideways with the primaries closest to the valvle cover onto of a 4 hole 50mm thick spacer. It was the only way I could get the linkage working and not have the vac. sec. pot hit the valve cover. I have not tried any other arrangement so I'can't comment on them. The current set up is Ok not perfect but I haven't spent a lot of time trying to make it so either as the carb will only be on for few more weeks.
