The comments and kind words are appreciated - thanks!!
Wheel choice was tricky.. first option was to go with the typical GM steelie rally wheels of the era - they're rather common, though. The 76 Caprice kit has correct wheel covers for the '77 Monte with only minimal modication to the Caprice vs. Monte emblem detail, although it seems according to the literature those caps were used on base model non-Landau cars.
I did come across some references to dealer-installed Landau packages - GM was having issues with the chrome trim peeling, and dealers worked with local installers to offer the upgrade. In those situations, a base Monte could easily have been outfitted with the roof and trim, and might have kept the base wheelcovers. It was food for thought... :-)