New to Slant 6

'72 with EGR? I didn't think anything had EGR before 73. could be a newer engine and/or manifold(s) in the car. Will be an easy thing to delete, anyway.
I had the opposite. in my 85 truck, which came to me with the manifolds in the bed (and none on the engine) the intake that came with my truck was old enough to have never been drilled or machined for EGR passages or the valve. I got it back together and running decent on the original engine, but I want more.
I am building up another slant for this truck, it's in the machine shop as we speak. In the process I have a Super 6 setup here for the new engine. and I put a 3/8NPT pipe plug in the EGR passage under the one carb barrel within the manifold. a little red loctite for good measure. and a blockoff plate to replace the valve.