Maybe if you change the flywheel, clutch, and fork it would work.....I'm not sure. The '72-8 trucks use an 11" clutch and matching flywheel. The '69-71 trucks use a 12" clutch and the flywheel is bigger in diameter. I don't know if the linkage mounting is in the same place or not either. I think the transmission bolt pattern is the same. Do you have all the other pieces to go with the bell housing? Yours is off a 383 truck?