$300 too much for a used 9" 3.50 Posi?

[55Sedan]

I found a used (but "in excellent condition") 9" center section with 3.50 gears and 31-spline limited slip posi on craigslist a few hours from my house. I don't have to pay shipping. He says the posi looks new and gears are in great shape. Is it worth it?

Going in a 55 Chevy Sedan with BBC and Muncie (unless I get a great deal on something like a T56). I'm going to be getting a housing built from Currie, Moser or Strange.

Larry