i'm guessing you're running obd1? i used inlinepro 370cc high imp. injectors just b/c they are plug and play and i didn't have to worry about wiring a resistor box or inline resistors for the low imp. injectors. check out RC's website, they've got alot of useful tools for helping you find out how big of an injector you'll need:

http://www.rceng.com/technical.htm