Heck of a big difference between your cubic inch and intake port cross sectional area ratio between the 528/440-1 combination and the 408/EQ combination. The 528 shouldn't get to choke rpm until about 7,300 rpm and the 408 will get there at 5,500 rpm. Now, if you can find another 1 square inch of cross sectional area in the EQ head I think you could get 650 HP. But 3.00 square inches in that head isn't going to happen without serious modifications.
So, my answer to your original question is 590-610 horsepower.