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I found the site while googling for info on my 73 lemon twist Duster 340. I knew I hit pay dirt right off, what a site for all kinds of info. One thing I am still looking for is the dimension for the snorkel hood scoop. I need to know how far the back of the scoop is from the back of the hood. I have seen 1-1/2", 2" and 3" on the site. Can anyone help me?