Ezplans,
You are exactly correct. Right now their aim is to get rid of the Cobras and then go full bore after the street rods, but they have already pulled some street rod titles that I know of. As for the Big Blocks having an advantage, don't get to excited. Per the BAR Referee here there is something in the works to change it some way because so many of them had multiple carbs it is impossible to make them meet any emissions. So look for some whacky law to limit the size or something as inane as that. He couldn't prove that a particular 427 came with one four barell instead of two. Best bet is a pre 65 engine of any kind and then use it until you can get a SB-100 number if they haven't done away with that by then. This state is really messed up and no two places will do the cars the same.
Ron