ARP makes a set of head bolts that have the 7/16" 302 thread size with a 1/2" shank to bolt 351W heads or aftermarket aluminum heads to the 302.
The chart I have shows the following:
69-74 C90E-B,D; D0OE-C,G; D0OZ-C; 60.4cc, 1.84/1.54 valves
75-77 D5TE-EB; same size as previous, but has...