Comp Cams XR280r thoughts to given combo

I ported some RPM heads for a customer who is running that cam in his Dart. I can’t recall if the motor is a 470 or 451, but I think it’s a 470.
Pump gas, street friendly 3.55 gears, all steel, full interior, etc.
It’s gone 10’s regularly at the track.

I have another customer who is running one in an RB 446, owner ported stage V heads and SD manifold.
it made 558.6hp@5900, 548.6tq@4700.
Still making 544.6hp@6500.
This one is in a 70 Charger with a 4 speed.