Revised fueling setup for Paxton

I have a 2001 w/ built engine and Paxton. It was built using a VEC along with the traditional Paxton fuel setup (i.e., 2 external pumps and the FMU).

I'm having some drivability issues so going to re-tune without the VEC, so figured now is a good time to upgrade the fuel setup to RSI's double hanger kit. Questions:

1 - What fuel pressure do I want to set the regulator at?

2 - When I set the fuel pressure, do I want the vacuum/boost port connected to the manifold, open to atmosphere, or does not matter?

3 - Can I connect the vacuum/boost port to any connection after the throttle body, or are there specific ones I do/don't want to use?

Sorry for dumb questions, I usually only build n/a engines so learning how boosted vehicles are setup (compounded by the fuuun of figuring out what the last owner did to the car)