Those heads in 2v form were on a Ford 400M, but it was like Mopars 400, a low compression dog. I had a Cleveland in a rather porky (3500 lbs by todays standards) 57 Fairlane 500 that kept up with a 6.6 Trans Am on a lonely freeway one morning, lock step. Great motors, they were a dime a dozen back then. Boss 302's were worshiped by the Mustang crowd. Not seeing anything spectacular in stock form. Now, the 71 R-Code Boss 351 was a hot mill.
