I'd support a 250 dyno day as well. I suspect most late-model Inliners run the 250 anyway. The 292 is not an easy drop-in for cars, like the 250, for most enthusiasts.
My offer to borrow the Clifford 3X2, and Algon, manifolds stands for either engine for a high RPM test. The Clifford intake will need the carbs rebuilt and linkage made and the Algon setup will need everything but the intake, linkage, injectors etc. I don't have a pump or any of the accessories. Maybe some other Inliners can provide carbs or mechanical FI resources.
