I have a book here. It's by Jim Osborn, 1969 camaro facts. It states that a base camaro V8 curb weight is 3145. I would add about 200 to 250 for the big block. I do not think you can get an accurate weight at a grain eleviator or a big truck scale. The reason for this is in the late 80's I started doing a mach up of my car. At this time I would use Allied Van line scales. They would be off 100 to 200lbs in eather direction. Truck scales are designed to weight heavy trucks ( 10,000 and up ) not cars (3,000 to 4,000 lbs) If you have a state inspection(??) station they should have some scales there. Go to a race track scales ther should be with in 50lbs or so. Rob, I'll answer your questions PM.
Thanks Larry