Wunnerful.
The Crown conversion, which used the Corvair Saginaw gearbox, worked well. Only problem was that the engine was just a little too far forward in the chassis, limiting seat adjustment. Radiators usually went in front.
Guy I ran slaloms against in the Ga.Tech Sports Car Club (he had a Corvair 140-powered Manx on Indy rubber and was unbeatable) later built and ran a big-block, mid-engined Chevy-powered Corvair convert in SCCA, running in A/ Sports Racing against hairy stuff like McLarens.
Life was better then.