I think that the photos speak for themselves. A few minor, shallow dents, and a bent corner, where the fender meets the door and cowl. That area is the only area that has some rust.
I should be able to bring it to Carlisle. PM me if interested.
You are reading the parts book correctly and clearly this is a brake booster to convert a manual brake car to power brake car, but the master cylinder is for a disc brake car and I am almost certain that manual disc brakes were not available in a C Body.
That is to convert a manual disc brake car to a power brake car. I don't think that C Body's came with manual disc brakes so you may want to check the application.
I can’t comment on the quality of the hood pads except to say that they are very fragile and friends have had the corners damaged during shipping. My recommendation is to buy from a vendor that can deliver the hood pad to Carlisle or the Nats so that you can inspect it and not worry about...