I have a 3.5 oil filter housing (as shown by Markos and Teahead herein) for sale, see Parts.
My 72 still has the original bottom bolt canister. I always remove the whole 4 bolt assembly from the engine block and lift it out from the top (only minimal drips from the block to a drain pan below) and then empty and clean the canister in a separate drain pan.
I wonder if spin adapter is available for our cars?