EFI tank with Carbureted engine plumbing questions

As far as running the lines, just run them side by side or in the case of under the rocker, one on top of the other. The standard clips will hold one line unless you get clips for CA spec car of the era that had to have an evap system, then it should have dual lines. Normally if I only have the single clips, I put one line on top of or next to the other one and then use some zip ties about every 6" or so. Of course if you are handy with sheet metal you can make some dual clips that you just bend around each line.