That is a toughie. I tried 3 or 4 Crane's like
364681
364761
361421
and none of them did any better than what you currently have. I then went with the last one I could find which is 361481
http://www.cranecams.com/master/apps/ford15.htm
Be warned that it is recommended for 12.5:1 compression and up. I would not consider it without a serious chat or two with Crane's tech support. You would also need to double check your springs and piston to valve clearance.
I have no idea what carb you have so I guessed 750. No idea on the manifold so I guessed VicJr. Your current engine estimates out at
HP 486@6500
TQ 439@5000
With 361481, you will actually lose HP and TQ but push RPM up another 500. It estimates out to
HP 480@7000
TQ 405@5500
Here are the two graphs
hope this info is useful
Andy