Which one? MSD AL6 or MSD AL6-2 for my stroker 418 (340)

Coffee&Cars said
Do you have a fuel return line? If not, you need one. Dead heading that Holly pump will give it a short life. The holly regulator is junk. Get a good brand with the right amount of ports, and with a seperate port on it for your fuel pressure gauge. Mount the gauge on the cowell in front of you so you can see it. Not in the cabin. Not under the hood where you can't see it when your driving.
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No I don't have a return line, its just what came out the box.. so they sell a set up thats going to fail?? is it really that important? I ask as got a tour racing alloy fuel cell so guess it would have to be totally removed, drained and drilled? and its behind rear seat under speaker shelf which is real tight..