What is the difference between the '64 Spyder and '65 Corsa turbo? They both have 164ci engine but why does the Corsa have 30 more horsepower over the Spyder? Can you use a '65-'66 turbocharger on a '62-'64 Spyder engine? And if doing that switch would it effectively increase the HP rating on the Spyder?

Both rear windows from an EM coupe. Includes trim and track. $100.00