Thank you. I am using Dougs headers. Haven't put the assembly in the car yet, but I know everyhting fits nicely on the K-frame.
I don't have the exact dimensions on the instrument cluster. You can just measure your stock instrument cluster and use that as a template. Mine took some light massaging to get it to fit perfect. I didn't want any gaps.
If you want me to measure the heights (yes, there is a taper along the height of the instrument cluster) and the distances between the points on the sides I can try, but it's already mounted in the cluster housing and wired to go in the car. I'll see what I can do tonight.