All I could find for ya.
I'm not sure about low and high Imp. as there are varying imp. and to justify a low and high is not up to me. The part # you gave is a 12ohm injector.
Wow, a 600" FI motor. That baby should put down some awesome torque numbers. Also, Siemans sells 60# high impedence injectors for $499, that is about the best price I have seen.