It's all about who you know.....
Do whatever makes you (your friend) happy. Everything will be illegal in 10 years anyways but noone will care. 1/2 of everything is illegal now and nobody cares. Cops know its ridiculous, we know it's ridiculous, stations know its ridiculous. They will only bust your butt if you give them reason. If the station thinks your car looks stock enough to get away with it and they like you to boot, they might take a risk. If you have a 6 foot tall hood scoop, no luck. Same thing with cops. If you're cruising around and being "nice", probably no problem. If you're attracting attention and showing off, they'll find a reason to mess with you.
I think they just want to take as many older cars off the road as they can to force people to buy new ones. If you're tinkering with an old car, your're not buying as new one and being a good little consumer.