Paul,
Nathan (pisces) here from the GVR-4 board. This discussion will get split a bit between here and there, but oh well...
As far as direct port injection, you can use two Aquamist nozzles with a single HSV, so only two HSVs will be needed not four. And driving the HSVs with an FIA2 is a snap to wire up. Unless you're running an aftermarket ECU, the MF2 isn't needed.
If you're still kicking around the idea of running a Shurflo pump with an Aquamist-based system let me know and I'll e-mail you a snazzy wiring/plumbing diagram (different from the one on the GVR-4 board) that sets everything straight.
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