Glad I stumbled upon this thread. I'm now in the beginning stages of doing the same swap. Gen I or II will be about it to keep my 3650 transmission. I don't see an issue with either Gen because it is a street/road race car, not a drop drag car. Hoping to save the tranny expense. Because I live in CA I can't do anything but direct swap with CARB and then only CARB approved replacement parts to keep it licensed. I hadn't thought about a non-return tie in fuel to pressure but that's a thought, although I'll most likely run a line to the tank.
I need to mate the two systems together and the Gen I or II will be complete with CATS to be legal. I intend to gain the 150+/- HP with the swap and run on pump gas. I have a email to BAR now so I'll know the exact details in my case for the swap. I'll continue to watch this and put links to my site as I proceed. This is a 2020 project. Tired of having the higher HP cars pass me in the Mustang when they can't keep up when I'm in the Cobra. Just need HP!!