Bellhousing

Are you looking for a bellhousing for a 9 1/2" clutch or a 10 1/2" clutch? If you have a 360 magnum engine, you'll be going with a 10 1/2" setup and you will need a special balanced flywheel. Plus a bunch of clutch linkage.
It appears that it is a LA 360, so it should have a 10.5" bell housing. I have yet to remove the trans. to check the casting number.