I have made an adapter to put a manual transmission behind a big block mopar v8. the catch is the pressure plate that will fit my flywheel calls for a 10.5" clutch disc. however the only clutch disc diameter that is available to fit my trans input shaft is a 9.5" diameter. I'm looking at using a diaphragm style pressure plate. is the .5" difference going to cause me any issues with clamping force for my clutch? other than this I see my only other options to be having my flywheel drilled to take the 9.5" pressure plate or to see if one of the big clutch manufactures can make me a disc with the shaft spline I need.