Mattituck sent me a new gasket to replace the wrong-sized one they'd originally sent me with the engine, so I was finally able to bolt the fuel injection servo to the engine. I put a thin coat of fuel lube on both sides of the gasket before installing it.
There aren't really any detailed instructions on how to mount this thing, other than a drawing in the plans that shows the correct orientation. In one of the bags of stuff that came with the engine I found some 5/16" nuts and star washers, so that's what I used to attach the fuel servo to the sump. Confusingly, the Lycoming overhaul manual calls out a torque value for 5/16" nuts that's noticeably higher than what AC43-13b says to use, but it's largely a point of academic interest – even using a crow's foot, there's no possible way to get a torque wrench onto at least two of the nuts, so I just wrenched them all by feel until they were good and tight.
Looking down the business end of the air intake, you can see the four airflow pickups (or whatever they're really called) in front of the closed throttle plate. The Bendix fuel injection system is a purely mechanical system, in which the amount of fuel metered to the cylinders varies with throttle position and the rate of air flow measured at the intake. It's a simple design that's been around since the 60's, and based on my experience flying other Bendix-equipped airplanes it all seems to work pretty well if it's properly set up and adjusted.
To keep unwanted junk from getting lodged in the intake throat, I covered it up with masking tape:
