Okay guys, so here's the deal. I was able to source a complete power disc brake set up from a '72 Charger about 4 years ago. According to the info I had at the time this is suppose to be a direct bolt in and factory appearing installation. I know that there are better aftermarket systems available but I want my '72 Challenger to appear as factory correct in every way possible. Included in the parts that I received are the original factory power brake booster and proportioning valve. I have two questions . .

1. Should I bother to have the booster restored or are there correct appearing replacements available?
2. Will the proportioning valve also need to be restored or rquired other attendtion or can I expect this thing to work without doing anything to it.