Hy Hambone, I found p/n 3889694 for 1963 - 65 292s there is a note about dowel pins, "1963-65 trucks w/292 eng will be necessary to align dowel pin hole and use dowel pin 3886062" That still doesn't tell us the clutch size, that flywheel also fits 1962-64 283s, hope that helps.
