well this is what I found out thru the net .The exhaust manifold bolts are in a straight line on a W, a Cleveland has them diagonal across each port. the fuel pump mount bolts are horizontal on a W, vertical on a C. !---A clevland will have a "cast in" timing cover area using just a flat cover and the 351w is an aluminum bolt on timing cover---Actually, in 1977, Ford went to the 5/8ths hex, 14mm plugs for the Windsors as well.
Be that as it may, a Cleveland has a thermostat housing that sets UPRIGHT on the front face of the cast-on front cover. A Windsor has a thermostat housing that sets facing the front of the motor and is bolted to the intake manifold. A Cleveland engine has diagonal bolt-holes for each exhaust manifold runner; a Windsors are on a horizontal plane. The fuel pump on a Windsor are horizontal--just like a small-block...gasp!...Chevrolet; the fuel pump on a Cleveland are on a vertical plane. A Cleveland has a square valve cover, using 8 bolts; a Windsor has a trapezoid valve cover, using 6 bolts.
And, before 77, the Windsors used the same plugs as the FE series; the pre-77 Clevelands used the small plugs.
A 351 Cleveland has the same bellhousing bolt pattern as a Windsor. A 351M-400 has the same bellhousing bolt pattern as the Lima engines (429-460)--except for a 1973 400 bolted in front of a Borg-Warner automatic.
The 351m and the 400 take motor mounts all their own. They are 1.09-inches taller than a 351C.
The 351M is simply a destroked 400.
. The 351W's and 351M's were, of course.
The Cleveland series are wider than the Windsors. In witch I have determined the information you guy and others my motor is a 71 351 cleveland thanks for all your help Okay I will addmit it I got off my duf and ran the casting numbers