I'm swapping in a Muncie M20 in place of my leaky Turbo 350 when I install my fresh 327. I caught a great deal on a new clutch from a local ad seller but didn't pull the tape on it. Turns out to be a 12 inch truck clutch. I was told that it would work. But now, doing more research and looking at the truck bell housing, GM part # 460486, I'm not sure that it will fit at the firewall or if there will be other clearance issues. I don't have the time (in the house garage) to trial and error test fit and would rather reboot on purchases to have the right parts and do it once. Does anyone have any experience or other knowledge of these parts? Any input will be greatly appreciated!