I used a stainless clutch pedal pad bracket for the 3/8" hole to hold my fuel line to the back of the head.
If you're comfortable enough with your welding skills, go ahead and weld it to the line!
"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.