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The harness doesn't attach to anything on the block/head.. the harness attaches to all the little accessories bolted on to those parts. So keep the manifolds you have now, but swap out the head/block together.
And actually, you can get better flow using the s13 cams. They have 240/248 or something like that and s14 is 232/232.
So put the s13 exhaust (248) on your intake side, and the s13 intake on your exhaust side.. but make sure you align them properly at TDC.
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