Oil Filtering Advice

[JOES31]

I need some advice from you Model A experts.

My 1931 A Tudor has no oil filter. I was thinking about adding one. There seem to be two different kits. One that attaches to the side valve cover and one attaches to the front timing gear housing. Could someone please explain what the difference is and which is best to use.

My other question on filtering is.....My A when hot and running has very little oil pressure. So how does the oil get forced through the filter element with little or no pressure? I would think anything less than 15psi would not do an efficient job of filtering oil. It almost seems like the add on filter kits would do little to filter the oil.

Any and all advice is greatly appreciated,

Thanks
Joe