M/T is wrong, the Mach 1 engine uses an alumimum block as did the 99-01 Cobra. The Mach 1 engine is pretty much the same as the 99-01 Cobra engine except for different cams. Having brain fade right now, I know only 2 of the 4 cams are different but can't remember if it was the intake or the exhaust cams that changed. If you want confirmation, got to the Mach 1 registry web-site. They will be able to fill you in on all the details there.