Fuel piping question

I want to run my aluminum line from rear pump to front regulator. My question is about going thru the frame where the trans cross member bolts at. Have you just drilled clearance holes to feed the fuel line thru. If so have you insulate the fuel line with any type of protection. The original steel line was just fed thru but with the làrger line thàt I'm using plus I will have a return line as well and its àluminum not steel if I should do something different. Once I do get thru that frame àrea the headers will be about 2.5" -3" from the line should I buy some heat reflecting to cover the line. Should I use the aluminum that close to the header or switch to the1/2" braided at that point continuing to regulator?
Thanks in àdvance for your thoughts,
Rod