First of all it will not fit Ford 300i6 with factory carbureted inlet manifold, despite what it says it will fit. The manifold studs are about 1/8" wider on each side (1/4" overall), so you'll need to drill 3/8" to 1/2" holes to make it work. This, of course, causes the screw heads to stick out further from the center. This caused no play issues on my Autolite 2100 carburetor. The carburetor was still able to fully open the butterflies without contact. That way you can be pretty sure you haveβ¦