I would say that class rules would be the primary reason. Out west we have a class called true street which requires either "Mickey Thompson ET Streets" or "Hoosier Quick Times".
Small blocks are anything under 434 CI and anything bigger is a big block, Pontiacs can be either. The minimum weight for small block with nitrous is 2950 and the minimum weight for a big block with nitrous is 3350. You can also use a two stage setup for small block but only a single stage for big blocks. From what I can tell traction is going to be the key factor in this class especially when you need to run 8.5 to 8.6 in quarter to be competative.
I would think running an IA2 with a 4.28" bore and a 3.75" stroke with KRE heads may be pretty competative. The key would be hitting 825 to 850 HP NA. This would be high RPM engine but there have been posts within the last week or two talking about similar engines that aready exist.
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