I take it you're on about the Cleveland 351 rather than the Windsor, since the Cleveland was the performance motor. Ford made a Boss 351 out of it for '71 - 11.1:1 compression (what they claimed, some sources say higher), nodular iron block and crank, modified heads, forged rods and forged domed pistons. Rated (conservatively) at 330hp.
The Windsor is still a viable route, though. Plenty of them about (Christ, they built them for decades) and they take a bit more abuse than a Cleveland. You could even build a Clevor - Windsor bottom end for the most part, custom pistons, modified Cleveland heads. The Clevor designation sometimes gets slapped on the 351 M (they did love that engine size, didn't they?) - the M is basically a short-stroke 400, compared with the other two it weighs more and it's bigger and the bellhousing bolts are arranged differently and it's probably not the best route to go down.