I agree with Andy.
That is a small cam for 520 CID, but you have nice heads to make power. I look for lots of lower rpm torque and a wide power band. I don't know if the dual plane intake or the small cam will cut off the 5000+ rpm power first.

I still would have put more cam duration in it...
I like the saying, "CID eats cam duration for breakfast"

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1