I am looking for a CAD file of the base of a 500CFM 2-barrel Holley. I am having a manifold made and it would make things a lot more accurate if I could get a CAD file of the carburettor base.

This image from the Holley site shows what I need at the top, the dimensions of the bolt centres and the outline. I just need a CAD file to give to the profile cutters.

Does anyone know where I might be able to get that?