With the cam you picked and the small headers and the 2.5 exhaust, your HP peak will be at 5500 RPm. You still might reach your gold of 500 HP. but the next larger cam would be a better choice. The RPM intake will make 40 lbs more torque down low ( 3500) But it will just spin your tires harder. The 3 inch exhaust is only worth a few HP over a nice 2.5 system.
JOE SHERMAN RACING ENGINES