Ford has just added the cylinder heads of the 760 horsepower supercharged 5.2L Predator V8 engine in the S550 Mustang Shelby GT500 to the Ford Performance catalog. The heads come with instructions for adding them to your run-of-the-mill 5.0L Coyote V8 engine found in the S550 Mustang GT and Mach 1 muscle cars. Officially billed as replacement parts for the current GT500, the cylinder heads are yanked from the same Canadian casting plant as the ones employed on the Shelby’s Predator V8. Listed in Ford Performance’s catalog under part numbers M-6050-M52B for the left side and M-6049-M52B for the…