Motor mount does not look like a fit for any RV series aircraft – mount seems to imply very small cowling – not enough depth (height) to fit an RV – I would guess a small Lancair.   Lancair?  Glastar? Other?  Looks like an RWS gear box.  Intake looks a bit familiar but then could just be similar to one I’ve seen before.  Cooling ducts could stand a redesign – looks like they used parallel rather than series GM cores for radiator, rectangular oil cooler on the bottom back of engine.

I don't recognize it either but a heck of a deal.  Good example of how NOT to do the RD-1X oil return.  Must not be below level of oil in pan.  Back pressure will cause rear oil seal to leak.

Tracy