And wasn't the Rover V8 engine also related to the Simca Vedette V8 engine? (Think Chrysler owned Simca so guess that's how it ended up with a Buick engine?)
Many moons ago someone down here (Land of Oz) decided to install a Rover V8 in a Piper Pawnee or some similar agricultural aircraft. Don't think he worried about the formalities of certification or even having a pilot's license or engineering qualifications. I think the authorities caught up with him on taxi trials, shortly before his first test flight.......
I also recall a gas turbine engined Rover - think it was in a Museum in London - the Museum of Modern Science?
I also feel the HS65 Argosy had a Rover turbine APU - and it was noisy, thirsty and rather "agricultural"!
Talking of turbine engine installations, many moons ago a Dart was being installed in a P51 Mustang in Canberra but I heard the aircraft never flew, the Dart was removed and the original engine re installed. That was in the days before War Birds were accepted here, the Mustang being the exception - it was civil certified in Australia for commercial flying operations (a civil target towing contract). Mustangs here were Australian built by CAC.
Yes, lovely aircraft the Chippie...... My very first flying lessons were in Chippies. The two at the local aeroclub were sold sometime in the 1960's for a reputed 850 Aussie quid each - Aus$1,700 or around 550 Pommy Quid each in todays money!