What you can do is go to a junkyard and find an H22 motor. Grab the yellow top injectors from it and the fuel injector resistor pack on the driver side strut tower area near the clutch reservoir. They're 345cc injectors but will need the resistor pack to work properly in the teggy. They also mount in the fuel rail with no problems.
DON'T go a lot larger than you need. The greater the size that you don't need, the harder it makes to tune idle and partial throttle. Sure you'll have growing room, but think about how often you're idling and how often you're at partial throttle as opposed to how much you're actully running WOT. Your performance (tunability) may actually suffer from running too large of an injector.
BTW, I have a set of 4 good 345cc's and the resistor pack for sale if you're interested. PM me, or wait for pics to be added to my for sale thread -
http://www.clubintegra.com/board/showthread.php?t=35318