When good is not enough, Camshaft time again.

I know I keep beating this dead horse. But you have a Hughes 3000 stall converter behind a 500 inch BB with TF heads. Your dyno guy says it's "stalling at 4500 rpm". To me that big a stall increase just screams blowing through the converter.

Also noteworthy, the Hughes 3000 is rated for 500-550 hp.

You can spend all the money in the world on cams and valvetrain, make more power, and never even know it if the TC isn't up to the task.

I'll shut up about this now. But that TC is for a mild warmed over 440, not a TF headed 500 incher.