The problem with the rules is not the rules. Its people reading into them what they want to see.
I agree completely. How can "1959 or earlier model year" be read into something that clearly states "1959 or earlier design"?
A big part of any type of racing has always been rules interpretation. Rules need to evolve as racers exploit the loopholes in them.
Many years ago, I inspected an SCCA Trans Am Sunoco Camaro. The rules at the time limited the fuel tank to 10 gallons. Ok, so Penske just installed a gigantic filler neck that held a couple of extra gallons. They found a way around the rules, and took advantage of it. The rule at the time didn't cover it, but it sure did the next year.
As someone said before, ask the Salt Cat guys. There was nothing in the XO rules prohibiting modified stock cylinder heads at the time they modified theirs. They found a loophole and took advantage of it. I'm sure they had a lot time, and perhaps a lot of money invested in their efforts, only to lose the records they had set (at least in XO).
So, now we're looking at another hole in the rules. It would be easy enough to fix so that nobody else wastes time and/or money on it. Or, would it be better to leave it as is so that only the insiders know what it really means?