If you convert to a spin-on filter, be sure to use the right one. Your engine probably has a bypass-type filter that has a very slow rate of flow. If you use a full-flow type filter you'll kill your oil pressure. There are a few spin-on filters for bypass systems with a small outlet orfice to maintain oil pressure. I have such a system on a 1961 American Motors Rambler flathead 6-cylinder. A filter such as this would work, as long as you use an adapter with the correct thread. Another option would be to use a return line with a restrictor bushing to control oil flow through a more conventional type of spin-on filter.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!