[Gaz64]

The externally adjustable bowls do have different height level plugs.

The secondary level if set as high the primary will flood the motor on heavy braking when the carb/s are mounted normally. That's why the sight plug is lower.

When they are mounted backwards for distributor clearance, now the primary will flood the engine on heavy braking.

The reason for why the rear barrels flood the engine on heavy braking is the main well is all liquid fuel while not on the main system.