I don't know if they make a block plate, but I made one out of 1/2" aluminum when I was in Japan. The manifold for my 55 warped and the only thing readily available was a sogger from a mid 70's Camaro. I ran it for 3 years and the guy I sold it to was running it two years after that. Just traced the EGR base on to the aluminum stock and cut away. Little gaste material and it worked great. I used the 1/2" because it was the same thickness as the base of the EGR valave and I could reuse those bolts without them bottoming out. It worked fine for me. Don't know wether it's "supposed" to or not. I either didn't know enough (probably) or someone told me that I didn't have to worry about anthing else.
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