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On my Autocross car I use the outlet strictly for a breather. Took a 3/4" hose barb and turned the threads down for a tight fit. Gooped it up with metal-type JB Weld, and it hasn't moved in eight seasons. I call that a win.

Well, a major update I suppose you could say. I drained enough gas out of the main tank to fill up my two gallon, placed both feed and return lines inside the two gallon can, and started it up. By my watch, the car ran for twenty minutes and sounded significantly better, with fuel pressure being about 34 PSI the whole time. It did abruptly die once at the end of the twenty minute mark with absolutley no warning, just completely died. Though it did restart right away with no issues and continued to run fine. Idle was at 1,500~ RPM, and I adjusted it down to about 1,000 via the set screw. I only attempted to rev it once due to how late it is, it seemed to rev mostly okay but stumbled as the RPM's dropped to around idle speed, though it did settle back into its idle shortly after. I did notice after I crossed over the twenty minute mark and restarted it after it had abruptly died, the fuel pressure did drop down to about 32~. If I unplugged the vacuum line on the FPR, it would get to near 40 PSi. It wasn't 100% by any means, but it sounded like it was actually running rather than missing and stumbling while trying to run. So, I'm assuming the elephant in the room must be the gas tank?

No need for the nipple unless you’re going to keep using the flow control valve, which is where that nipple goes to. This is a 280 right, so you don’t have that, your tank vent is via the charcoal canister. I really should go back and read the start of the thread…. If you really want one with a knipple, I can send you one of mine.