I checked the tracking on the propeller. The instructions -- I can't recall whether it's Van's instructions or the Sensenich instructions -- said the blades should be weithin 1/8" or 3/8" (I forget which) of each other. I placed the props vertically and measured and they are exactly perfect! Yahtzee!
Then I returned the spinner to its rightful place and attached it with the stainless screws and plastic washers.
I returned all spark plugs to their proper location but did not torque them yet as I have some fogging oil spray on order and I figured it wouldn't be a bad idea to squirt some in the cylinders for protection.
Other than that, I'm not sure what more I can do right now since two major components are still on backorder from Van's -- the replacement engine mount standoff and the replacement muffler pipe. They're not due to be in for at least another month, and I suspect longer. Communication from Van's to keep me updated has not been particularly good.
Maybe it's time to bite the bullet and order the avionics kit.