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Hey ya'll, I picked up a set of Doug's 453's for my 74 Duster with a 360 and 727 from Summit. Before I bought them I looked and read the 453's were the way to go. I SWEAR I read the Doug's 453s were the ones I need. Box finally showed up today and as I was looking at the paperwork I noticed it...

I've got a 74 Duster with a 360 and I assume late(r) model Magnum heads. I do not know what year the heads are, they are installed and the stampings read, 5300 and 667 and NH. The only thing I found on the ole interweb has me believing they are post 92 Magnum heads. More info: manual steering...