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Re: 1965 gmc exhaust manifolds
The manifolds that dump straight down are for the '63-'66 trucks with a small block in it's original location. Since you have moved the engine forward, similar to the '67-'72's, you will need to use the manifolds that the '67-'72's use. Those are the ones that are angled towards the rear. Of course this is assuming you used the correct '67-'72 small block motor mount brackets. I don't know if they will work if you have something else in there.
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