I have a 365 454 Mag, could this combo be put together as a kit? Im looking for some more mph this coming season and was looking along the lines of heads/cam

Since you have a mag motor, you should already have the rectangle port heads, although mine are setup with the isky springs to match the roller cam. The cam was spec'd to match the heads and was a roller upgrade to a merc 420. With a roller cam, they were similar to the hp450.

one cam sold