What do I do with stock 5.3L fuel regulator for my swap?

[derotoreut]

I'm doing a 5.3L vortec LM7 swap and installing rear fuel tank with Walbro in-tank pump and Corvette filter with return. So what do I do with my current fuel set up. I have little to no knowledge of these swaps. Learning as I go here, so be gentle. Lol. I assume the upper 3/8" line is the fuel supply and the lower 5/16" is the return. Do I plug the lower 5/16" return line since it won't be used? Can I just remove the vacuum line going from rail to intake? And plug each end?

Assuming upper 3/8" line is feed and lower 5/16" was original return. Can I plug the return with high pressure fitting?


Is this part of fuel regulator? Can it be removed and do I need to plug off upper and lower vac ports?


This one is cracked.