I've been thinking about this combo for some time and would like input as to what it could make HP wise?

6.4 factory short block.
03 to 08 5.7 hemi heads, hand ported and stock valve. About 300 cfm at .600
6.4 hemi standard tranny cam. I think its bigger than the auto. Lift I think is .557 int .537 Ex.
If my calculations are correct running the 03-08 head would result in a 9.5 compression.
With headers and a drag pack intake, would 540 hp at 6500 be possible?