Best way to cap the return fuel line at the fuel tank? Options

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Good morning – I hope everybody had a good weekend and got some driving in.

I was hoping to get some coaching and best practices on the best way to The return line on the fuel tank itself as part of a carb conversion. I have a low pressure rotary pump that I’ve used successfully elsewhere and while I know there is some debate on this when I went and checked one of my other cars has this exact set up and has been trouble free as far as fueling goes for the past several years.

Ideally, perhaps, there would be an aluminum that screws right on, but I haven’t found that yet, and I am keen to hear how others have addressed this.

Thanks!