for your consideration,
the boss 351 for 71' was 4 inch stroke with a 3.50 stroke. the cam was .477 but your forgetting thats with 1.6 rockers actual lift was .515 due to the fact both the 302 and the 351 boss's ran 1.73 rockers. take .477 divide that by 1.6 =.298 multiply that by 1.73 to reveal the true lift of .515. this cam also was 230 @ .050 with an advertised duration of 290. rear end gearing of 3.91:9 with a compression of 11.1 for the 302 and 11.70:1 for the 351. both the 351 and 302 ran cams of same specs.
the boss's if i recall dominated racing, I'd go with the stangs over the camero's