panelman

Hey i am swaping my/6 3spd std for a 318 A833 i have an orig cast iron BH for a `64-5-6 A body but it is for a 91/2"flywheel. my ? is IF i can find a 91/2" flywheel will it bolt to my 318 crank VS going to a 10 1/2" set up Clearance probs i dont want to mod firewall will be using shumacker mnts and floor 4spd any replies appreciated