6.12 & 6.13 Allows the spec carbureted engines. I don't see any posts with folks using these, or asking about them. What kind of power do they put down and is anyone competitive with these setups? I have more than a few vortec 5.7 laying around from 96-99 chevy trucks, tahoes, ect. Just curious if they could be used as spare engines. Update/Backdate rules should not apply in this instance as the rule states the spec as a 5.7 liter with those specific components. Curious about their power numbers. My first tech question of many.