The 351W heads are almost a direct bolt-on except for hardened washers for the 1/2" bolt holes instead of 7/16" on the 302 heads. Try to find the small chamber 69-70 heads which are 60cc, otherwise you'll lose compression. Those heads have 1.84/1.54 valves which are bigger than the 1.78's on the 302 heads. Better flow. You can use your intake. 351C are Almost impossible and not feasible to put on .