"Listen, I would take EFI over a carb any day (assuming you can get both to work right) but given the era that some of these cars came from, I bet they make a good bit of gains percentage-wise."

You mean the Mesozoic era? What you are saying is entirely possible. All we can ask is that significant variables between cars are either equalized within the rules (allowing all ECU cars free run on there sensors), or accounted for through the process. If the antiques have more power potential the process should account for this factor as much as it should account for the advantages of FI vs. carbs. In this case how would would you equalize a 280z with FI, with 240 and 260z's that have carbs? Engine architecture is the same, and supposedly the 280 has better flowing options in terms of head design (though lower comp.) and of course greater displacement.