i have a 66 fastback with a 66 289 engine that should produce 300 hp plus easily. it has a toploader 4 speed . now i am trying to decide which clutch and pressure plate to use. will a 66 flywheel take a 10 inch and 10.5 inch clutch or am i stuck with one size ? the clutch and pp that was originally on the flywheel was a 10 inch . any help ?????