Liberty Bell is one of my favorite EM's. It's funny, I wasn't even alive at the time, but I really like stuff from the Bicentennial. There's just a vibe about the mid 70's that i really dig. I have a a few Bicentennial decorations around my home, they fit in well because I live in Philadelphia.
Funny enough, a local guy was taking a Liberty Bell to the last Allentown show and I mentioned that I thought it was a cool game. He replied by saying, "Yeah, it's kinda neat... if you like the Bicentennial." He didn't say it in a mean way, just kind of sarcastically. My wife and I laughed and he was puzzled. She explained that I actually do like the Bicentennial. I couldn't tell if he was embarrassed for mocking something that I liked or wierded out that I liked it.
I offered to buy it from him for his asking price right then and there, but he refused because he "wanted to have a good number of games to take to the show".
Good luck with the restore, I hope you have a VCR to see what's on the tape!