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The injectors are 65lb units on the 9C1, and the Civie has 55lb'ers. If you want to use the 9C1 EPROM efficiently, you will need the injectors.
Correct. If you just swap PROM's, you'll be tending toward lean without the higher flow injectors.

don't 9c1's have an L98 cam too?
Yes. 9C1's got a better exhaust system from the factory and the '773 cam, which is really close to the LT1 cam. All civvie cars, whether 305 or 350, got the pathetic '155 cam. (http://www.gmtips.com/3rd-degree/dox/tips/cams/cams.htm)

Also, ESC modules are 9C1 specific, as is the ICM. If you want to run this prom chip, it would be best to get all these parts as well.
 
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