408 wont rev past 4500

[brainsboy]

My 408 has neck breaking power up to 4500 but after that it seems to rev up slower and doesnt want to pull as hard. It still will rev up to 6K but certainly doesnt have the power it should. Just curious what you guys thought about my setup, or if have any idea's where to start. I checked my fuel pressure and it drops to about 3psi under hard acceleration but that should still be enough I would think.

408 callies crank
Carrillo rods 6.25"
10.68:1 compression, Full floating
Aluminum topline heads 215cc runners 2.08/1.60 valves
int-289cfm@.500 exh- 202cfm@.500
Victor jr intake port matched
hydrolic roller 224/.568lift listed rpm 2500-6000
Edelbrock 750cfm carb
1-3/4" headers
Mallory distributor
MSD6-AL with Blaster 2 coil

Also I noticed when I take the coil wire off the coil, and turn the ignition on and off the coil jumps a spark to its negitive side. I thought the coil was bad so I bought a new accel coil and it did the same thing, so im guessing thats normal, just never noticed it from any of my MSD boxes before.