Haha, you guys are good.
Don't forget, that allowance all carries with it a restriction-
Substitute parts which provide improvements in performance (e.g. superior gearing, lighter
weight, better camshaft proﬁle, etc.) are not permitted under this allowance.
The hard thing about the no-longer-in-production thing, is it doesn't allow you to put better-performing stuff in. For instance, I probably can't get OEM carpet and sound deadening pad, so I need to show whatever I have in there is no lighter than what was stock (if protested).
For engine components, it's even more complicated. Things that are more "durable" or have increased ability to withstand racing/high revs, even if they're not lighter, can also be considered performance-enhancing. An example might be replacing a cast component with something forged. Though I think the 302 had all forged internals? In any case, I am best off from a legality perspective if I can find OEM parts.
Normally protests don't happen at local events. But every year I make the big trip from San Diego to the midwest (used to be Topeka, KS, now it's Lincoln, NE) to compete against the best in the country. Everybody there has a lot of $ and time invested not just in their cars, but in the travel and general preparation. It's there, people really look at each others' cars, and protests happen.
The other thing about the '67 - pretty sure it's the only year it could be had without a heater, and all the HVAC stuff is more weight savings. We also have a funny rule in there (actually it's in Section 13 of the Rulebook, the Stock allowances, which the Street Touring category inherits) - any car before the 1968 model year, is allowed to replace its distributor. At this point I'm not sure if the '67 302 used points or the transistorized ignition, but in any case, the ability to put in a modern distributor with tunable advance curves, should be an advantage.