Make sure you have read the threads in the EFI section. I personally have the MS2 extra running just fine. The 3.57 board gave some guys fits with sync loss at higher RPM, but I believe this was fixed with a simple resistor.... ask Texas Twister (aka Ian). I don't run full sequential (requires 5 more driver chips) but he does. I have batch fire ignition and full fuel control.
Lazaby (aka Shannon) is working on mounting a TPS the same way that Darcom did. I didn't have to since I'm using a different throttle body/intake. You WILL need to either keep your idle air module (beware of it getting in the way of fuel rails) or use a new stepper motor type with pintle that goes into a machined aluminum block. Again, see threads. Air and water temp sensors are simple GM units IIRC. Make sure the incoming air one is not mounted in metal that soaks up engine heat.
I use 19 lb/hr injectors. I know Ian has bigger ones. The risk with bigger ones is that the open time at idle can be very short and less controllable, leading to rough idle. I'm able to get rock smooth idle with no shortage at high RPM.