Agreed on the *should* but I guess I mean I am not going to spend hours on the interweb trying to answer the manifold question when I bet a used one to start a mock up can be had for <$100

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1986 300 SDL - rolling parts car and test bed.
1987 300 SDL - semi daily driver.
1977 U1000 Unimog
2007 Ram 2500 6.7l