Saw your plea on the 63-67 forum.
Could you give a bit better description of the area that's rusted? Do you mean the pillar alongside the windshield, between the edge of the windshield and the door side window? This is part of the metal "bidcage" frame for the windshield and for the fiberglass body, which gives the body it's rigidity.
If so, it's likely due to leakage around the windshield and the source of the leak has to be found and fixed before it causes serious damage (if it hasn't gone too far already). I am no expert in this, but I expect it would require an experienced Corvette body man to replace that area using pieces cut from a rust-free donor car. If this work has to be done, it will be expensive since any bonded fiberglass has to be stripped away (which may uncover yet more hidden damage) in order to weld in a replacement portion, then the fiberglass must be built up again and the area repainted... depending on where the damage is, it may be necessary to remove the dash (certainly the windshield has to come out) to provide working room.
If the damage isn't that extensive that it requires new metal, it may be a matter of stripping the fiberglass, grinding off the rust, and treating the area with rust deterrent paints in hopes of stopping further rusting, but it still requires that you find the source of the leak and do everything I outlined above, with the exception of the welding.
You might try emailing Jerry Bramlett to see if he can give you more information. He is in the business of restoring Corvettes, and I know he addressed a question on this issue once on the NCRS dicussion board (I don't know if he checks this forum):
jerrybramlett@comcast.net
