8 oz of steak is not 8 oz of protein. According to MFP, a grilled 8 oz ribeye, for example, has 33 grams of fat, and only 15 of protein.

Now, an 8 oz filet, on the other hand, because it's much leaner, has about half the fat and twice the protein.

If you pick well marbled steaks, you will be fine; they have significant amounts of fat, and less significant amounts of protein.