Would this be a deal breaker?

Hey guys,

I finally found an actual Demon that is selling for $5500 with its numbers matching 340 and 4 speed. (It currently has a 318 in it). Surprisingly the only MAJOR rust is on the bottom of one door. And on the quarter.

Basically, I know how to replace a quarter, but is this also effecting other areas? And will it be not so complex to fix?

But, most of all, would this make it not a good deal?

Pic: http://images.craigslist.org/00d0d_2B2GxKfoQ8Y_600x450.jpg