I don't know how hard it will be. The 302 came stock in the 1975-1978 Mustang II's. It had all of about 1/2" clearance on the passenger side, and 1 1/2" on the drivers side. It ran standard exhaust manifolds, I would think the 351 would wind up being a little harder to fit in there, but I'm not super sure. You may need to bang the inner fender a little to get it to fit.
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