Anything else I'd have to upgrade right off the bat, or could I install these two things basically plug and play?

 

Yeah, you can install them both right now.

 

Fuel pump, good filter?

 

WARNING!
Be aware that pushing up the boost can quickly exceed the limits of the stock fuel delivery.
When that happens under power, you run lean and detonate the engine.
The apex seals will not tolerate detonation.
You will absolutely need a mechanical boost gauge. The stock turbo can push up to 15PSI under some conditions and the dash gauge may not show it.
Anything over 9PSI without extra fuel and/or spark retard is very risky.

BTDT:
This is my cracked apex seal after hitting 10PSI with an FCD & MBC on the stock fuel & timing.

 

Ouch, sorry to hear that! ^

You should be able to just plug those in, but as was stated, make sure you take precautions to not blow your engine.

 

What precautions should I take? Upgraded fuel pump? (Perhaps the FD fuel pump?)

 

720 secondaries and a walbro will do.

 

That was over 3 years ago.
Boost was instantly addictive.
I then installed & beefed up the wiring to a 255LPH pump, and installed 720cc secondary injectors with an Apexi S-AFC to tune it.
Then I rebuilt the motor.