J.S.J

I just got my 93FD engine in and have about 40 miles on the engine. Its a street port with no other mods as yet. It idles rough and I was told that thats "normal". Can anyone give me an idea of how often the injectors degrade/become restricted/ etc. I have a injector balance pulse unit and can mock up a flow test but just wanted to know a little about the injector reliability. I worked for many G.M. dealers and some not all of there injectors had reputations good and bad. I also wonder when it would be a good time to test the compression?
P.S. My Jaguar engine mounts work great?