By the pictures, your Hood doesn't look too bad. They are pretty hard to find in good condition or better. Besides rust problems, they will bend near the middle at the "dimples". They are there for crash safety reasons. When the Hood Hinges get a little stiff from lack of lubrication, they can tend to bend at these points. Keep your Hood Hinges lubed, but not over lubed. Too much and your Hood will not stay up. Even though it would go against the safety feature, there are ways to straighten and re-support the Hood by some creative welding.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America