[Rev]

I feel that the plain Performer is hurting your combination. I would go for an Air Gap RPM with a Holley or Demon 750. A 351W with that cam should be able to use it especially with better heads (AFR, TrickFlow, Canfield, etc.)

I also feel that you have enough stall with those 410 gears. I'm wondering where your power peak is? A dyno pull might be helpful to get optimum tune.

Rev