[blykins]

What intake?

If the heads are out of the box heads with a valve job, I don't think the cam will pull up that high. Comp Cam's notes are not for the particular cubic inch displacement that you're running, but for the smallest in that category. So if you look at their catalog, look at the cams for a 351W, and pick one that will peak at 6200, then it may be close to that for a 351. For a 427, it will be a lot lower.

I did a 425ci Windsor with those heads, a similar camshaft, and a Victor Jr. intake. Running about 10.25:1. It made about 485hp @5400.

I would expect this one to be a little higher, probably around 510-520hp, but then there are stingy dynos and there are liberal dynos...