Ol' Fart's Firebird Fantasy

I've been following your thread from the begining. More and more I read into it, I question if you are really looking to do this. There are people who just want to talk about it and that's fine.

If you want to build a car, find something that fits your budget and go. If you have a car and it fits a class, it might be best to build that car around the rules. It's easier and cheaper to build an engine then a whole car.

If you have trouble interpreting the rule book and have to ask countless questions about it every day, this deal might not be for you. Maybe try to show up at a track and observe different cars and how they are put together. I'm sure if the rear end housing is slightly off width wise you will be ok. Especially if the car is a 77 Bonniville, who the hell would know that, or come to the race with that info. If you had a Camaro or a Mustang it should be right, and it would be easy to tell by the rim offset and tire placement . As long as the tires fit correctly you should be fine.
I'm not sure you have the right judge what is more or less illegal with other car in the class when you don't and have never raced in it. Either crap or get off the pot, this post of 10 pages of how about and what do you think of this. When you start building a car then start a new one about it.