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Chances are your head gasket is probably thicker than the factory gasket. It might actually line up better check and see.

I milled my 360 heads .040 and had no problem with the intake manifold. They did ride a little on the bottom of the bolt holes. Try it if it don't work oblong the bolt holes.

Had one just like it except it was a 4bbl design and for a 440. Runners were about 2 in. long then turned into a huge plenum. Tried it on my car. It was horrible. Nothing till about 4500 rpm and still not great. My weiand single plane xcelorator was way better. I think they were for nascar motors.