I used a stainless clutch pedal pad bracket for the 3/8″ hole to hold my fuel line to the back of the head. (pics #1 & 2)

If you’re comfortable enough with your welding skills, go ahead and weld it to the line! (pic 3)

“Yeah, I have a 31″ die for 3/8″ hard line” In fact, everyone does – use the grooves on your tire to hold the line, then gently persuade it around the circumference.  The rubber will give a little bit so the tube won’t buckle unless you really haul on it. (pics 4 +)