A 1970 Plymouth Barracuda powered by a Hemi V-8 is catnip to car collectors, and now the first one of these iconic muscle cars built is up for sale. First spotted by Muscle Cars & Trucks, the car is being offered by Indiana-based Motorvault for a cool $2.2 million. An ordinary Hemi ‘Cuda (as performance versions were badged beginning in 1970)…