How to replace fuel pressure regulator

Hey guys, I'm trying to replace the stock FPR with an Adjustable one, but the stock one seems kinda hard to get to. It's attached by three hex screws which are upside-down, making it hard to reach.

I removed the EGR valve so far, but from how inaccessible the hex screws of the FPR are, I'm thinking I might have to remove the throttle body assembly as well.

For anyone who's replaced the FPR on your Mustang, what's the easiest way to do it?

Yeah, I figured it might come down to removing the upper intake. Is there a gasket that I need to get to replace an old one when I remove it?

I'm replacing the stock FPR with a Professional Products Adjustable Fuel Pressure regulator. I'm currently experiencing a rich condition with my car and I've seen the fp as high as 55-60 psi about 15 min after warmup. At that point, the car begins to bog down (I think the ECM is detecting the rich contidion and hight fuel pressure and is cutting the power to the injectors to try and compensate) until it dies. I believe it's due to a faulty fpr, as the whole point of it is to regulate the fp and keep it steady.

BTW, I have a timing issue with it as well (I'm the guy who started the "Calling all tech wizards, here's a doozy..." thread), and I just need to keep the fuel pressure steady to keep the engine running so I can get it to a mechanic who can take a look. At this point, even though I set the timing, it's experiencing a very rich condition, and when the ECM goes into closed loop, it detects that and begins to shut down the engine.

I'll keep you guys posted...see what happens.

Thanks for the tips!