I hope you plan on doing the mpfi swap...if not you're really not gaining anything but dirty hands.......
the si ecu requires the a6 dizzy because it has the crank angle positioning sensor and the cylinder 1 positioning senser inside of it unlike the dx dizzy..if you try and use the dx dizzy and not hook up the 2wires your car will hit revlimiter at 3grand and miss hella bad..I tried it...haha.....you also might have to change the plugs on your harness...my car had square plug and the dizzy had round....rewire it...I did it...its actually pretty easy....