You know, I went with a mechanical fuel pump for reliability...

I'm kind of late on this but NPTF are dryseal threads designed for F=fuel.

I have that pump using 1/4" on the pump side with an AN on the other side
hooked up to the fuel line with an fittings on it. I have solid SS line coming in
and a russell flex line from the pump to the carb fwiw. I can take pictures if
you would like.