Yes, we need more info to say exactly what class you fit into. Here are the full set of rules but feel free to ask more here.
3 heads up power adder classes are Unlimited, Super Pro and Pro. You can of course run Index as well on top of any heads up class. Both are included with your entry fee.
Unlimited is as it sounds, any configuration allowed.
Super Pro is any configuration but must retain stock computer/pcm, trans or IRS.
Pro is single power adder with weight and power adder restrictions. (I assume this is where you would fit)