that would be false, it is just a gasket, there is no magic involved. You would have to get one the proper thickness, (what that would be I have no idea) But I'm thinking what ever will give the proper clearance should be what you will need. There may be some NOS gaskets out there, however it will probably be pretty dried up by now, probably could soak it in some diesel or something to soften it up. But I am pretty sure chevy stopped making those many years ago. You could try jim carter, chevs of the 40's, egge to start with. there are others, but between these three and the place down the street I haven't had to go anywhere else.