Your conclusion is indeed correct. They are adapters. I e-mailed Mike (Sharkey) about them a few weeks ago. If I recall the valve covers are from Tony Branda @ $149. The adapters from Olthoff Racing @ $170 +/-. I plan on doing this over the Winter... or sooner! Mike sent me some close up shots of the set up. And it looks pretty good. Plus, the air cleaner looks to be a "repro" 289 HP unit.
