The issue with a RWD car with room for a V8 is the room for traditional hot rodding. IMO it already has sporty potential.
A real sleeper would need more fabrication (engine mounts, custom turbos etc) than writing a check to summit racing. Go cruising in a nicely painted six cylinder Lemans and everyone will assume you have a 500hp GTO.
So the turbo dodges from the 80s are among the best sleepers, still new enough they're assumed to be old beaters, and with enough slow cousins to lower an onlooker's average expectation of speed.
A real sleeper would need more fabrication (engine mounts, custom turbos etc) than writing a check to summit racing. Go cruising in a nicely painted six cylinder Lemans and everyone will assume you have a 500hp GTO.
So the turbo dodges from the 80s are among the best sleepers, still new enough they're assumed to be old beaters, and with enough slow cousins to lower an onlooker's average expectation of speed.