I have my old motor sittin around so i decided to build a budget engine. I got an e-303 cam, new 306 pistons, explorer gt-40 intake manifold (junk yard). Should I go with the gt-40p heads from the explorer i got the manifold from or some 351w heads. Both sets will be from the junk yard and sent to the machine shop. Not quite shure if the intake manifold will bolt to 351w heads does anyone know? What kind of power #s and et's should expect.