Installing fuel outlets on stock tank

Here’s a couple, not the best, the tank is propped up on the front. There are two 90 degree elbows on the bottom with rubber line coming off of them and they go to a ‘tee’ fitting. I have no idea how the elbows are attached, they were on when I got the car. I switched tanks to go to EFI

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How well did it work any problems
Why two inlets?