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Specifically, I have 440-1 heads on a B engine and thought at one time there were "spacers" to run RB intakes on the B block. I have no problem machining something like that up if it will work. (Or modify some type of existing spacer)

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I think your thinking of the Mopar Stage 6 heads only Not the 440-1 I recently swithed a set of 440-1 from a 440 block to my 400 stroker motor, I had to use a 440-3 intake on the 440 block and a 400-3 on the low deck