I am currently running a stock 3/8 OD (.300th ID) fuel line for my stroker motor with a mechanical pump. I have never had an issue with fuel pressure.

I am converting to EFI. I will be using an intank fuel pump. The EFI system comes with 6AN connection fittings. I wanted to purchase some PTFE hose but the ID for 6AN is .312th. If I use standard 3/8 EFI hose the ID is .375. Should I stick with the .312th ID or upgrade to 8AN? How much HP will 6AN support?