Hmmm,
I did a bit more digging. Apparently, all mods legal in Street Prepared (which is darn near everything) are legal for street mod. Also, seems you can run race rubber if you so desire.
This past weekend, I watched a modded Camaro smoke all the rest of the SM cars...So you might be competing against a lot of tough cars. From what I saw on your car page (list of suspension & engine mods) you should be well positioned for some trophies.
With so many miles on my odo, I am tempted to drop a 3L in when it comes time to change motors. I just need a lot more seat time to be competitive...