I wanted my spin-on filter in the original location at least so I used a Moroso much-too-expensive adapter. I bought a model which uses a GM filter but these apparently don't have bypass valves. I ended up using a NAPA filter w/bypass valve designed for a Wisconsin engine!

I think if you bought the adapter for a F*rd filter, these filters include the by-pass valve. Check that.

(Note: I first used 2 pressure gauges to check the pressure before and after the filter upon start-up.)

Spin on oil filter on my 261.
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1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.