Here's a random idea I had that may not be as crazy as I first thought. It might even come close to economic feasibility. Someone should cast up some Ardun look-alike heads that will bolt to a small block Chevrolet block with the attendant bits and pieces. In addition, make a front casing the picks up the SBC mounting points, but will mount two Ford water pumps and either a front mount (easier) or 8BA post type distributor. Voila, a brand new engine what would be almost undetectable from a genuine Ardun at the cost not much more than a high-end flathead build. Except for the added parts, everythiung else would be a commodity (except maybe pistons, but since there are a jillion piston manufacturers out there, that should be solvable too).
Arduns for the masses!
I told you it was crazy.