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Why not take the old bolt(s) to the hardware store? You'll not only be able to find out what size they are but while there you can buy new ones. Make sure they are the same grade, look at the bolt head and count the number of lines on it.
Take an old bolt to a mashine shop, they will tell you exactly whithin a couple of seconds what size, thread etc it is.
Günther
I know I may be stupid but I'm not a complete idiot. The car was in parts when I got it and the only two bolts left in the frame are so rusty that I can't even get a diameter off them, let alone get a thread pitch gauge on them. They look like brown spikes.
All I want to know is whether the bolts are UNC or UNF and what size the thread is. Doesn't old Chevey stuff only use about 10 bolt sizes?
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.