I pulled the starter off the engine and filed off the two lower lugs to provide clearance for the snorkel.
You can see here that with the snorkel in place and the lugs gone, there is right at 1/8″ of clearance between the starter and the snorkel. This is the minimum clearance specified by the plans, and I needed to get it this tight to allow the snorkel to swing up far enough to place the inlet in the best part of the ramp.
