I have to replace the stock fuel pump on my '68 (400), and I opted for an Edelbrock (part 1713). The stock has three lines, one fuel in, one fuel out, and then another fuel line going back to the tank, for which I assume is a vapor return line. ?

Can I just plug that line, because the Edelbrock fuel pump only has 1 in and 1 out. This fuel pump is for pontiac v8's.