I have found that the SEM Chassis black matches as close as possible. I have usually had the k-frame powder coated since it can get oil and gas ext. on it. Gloss with a slight bit of dullness to it. I also have found that the Eastwood chassis black is more flat like would be on a Chevy.
69 Road Runner vert 69 GTX hard top 70 Road Runner 4 speed 70 Hemi Cuda vert