The early S-O-S filters are once again available from Dennis Carpenter.
Yes, the filter is in the return line to the sump and is far than ideal but it is better than nothing.
Since the filter is beneath the top cover it is rarely, if ever changed and is, no doubt, in bypass mode.
DO NOT attempt to remove the top cover until you have procured a proper Ford service manual and have read and understood the R & R procedures.
Be certain to clean the inlet strainer at the same time.