[roger1]

Thanks for your input guys.

After thinking about this and doing a little more research, an OEM efi filter with the old style flare ends just doesn't exist. Neither does one with 6AN fittings.
I would like to have an OEM filter since I am going to use this car for long trips. I don't want to buy a bad tank of gas on the highway somewhere and not be able to easily buy a new filter.

So, I am going to get a couple of 6AN to 16mm X 1.5 o-ring adapters and use the Fram G3727 (used on '83-'05 GM efi cars). It's a 10 micron filter.
I'll then get 6AN tube nuts and sleeves for the 3/8 hard line to connect everything.