Hey Nick IMO you are on the right track. I like the Corbeau seats you suggested and the price is pretty good. I have not sat in them but the shape looks like something i would go for.
I also like the Recaro seat Fesler used in the black Chevelle. I believe they are the Ergonomics Series. The are quite a bit more than the Corbeaus but i have seen people use them and say the are awsome.
My 3rd suggestion is the stock seats from an 05-06 GTO. I've seen people use them as well and i think its an awsome seat. The price is right
(500-700 for Front and Back seats) But some people say it takes a lil massaging to get them in. The rear dimensions are perfect for a 70 chevelle. The rear is a "bucket" style rear but you can have that re-worked if you are going to have them recovered anyway.
You have some good Options here. Keep us posted on what you go with.
