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					Originally Posted by  TJ's GMC
					 
				 
				Yeah, the manifold is from a 62 D series. I've always enjoyed fabricating so I don't mind the little extra challenge. Long as I don't screw this up beyond repair I'll be ok. haha! 
			
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 After you left yesterday, Tom, I realized that the manifold you bought from me was from the original engine (305D) out of my '62 Suburban that I replaced with a 401.
I'd recommend having a machine shop mill down the top surface for you.  Then you could use a grinder to open up the hole and the insides if you're trying to do as much as you can yourself.