72 340 Rebuild

hi, the 73 manifold has EGR fittings in floor of manifold, 72 doesn't. the 71 & 72 manifolds are same casting number. carbs have different part number, otherwise the same. btw, this combo on a stocker will run very low 11 to high 10's. just looked up E/SA record, 360 duster, 10.49@ 123.94, manifold is same style casting.