400 Gross power?

In the late 80’s i re-ringed a couple of 100,000 mile 400’s that got to see some bracket race use.
One got bowl blended 346’s put on it, a swap meet dp4b, swap meet 3310, used white box special cam(same as Lunati .480 bracketmaster), PAW re-ring kit for the bottom end.
Cleaned everything really well, deglazed the bores, slapped it back together.
Went 12’s in a Duster with 4.10’s and a GER 10” converter.

The other one got some bowl blended 516’s, new SD intake, new 650dp carb, new MP484 cam...... same PAW re-ring kit and lower end prep.
That went into a 71 Charger with 4.10’s and another GER 10” converter.
Mid-13’s from that one, and it stayed in the car and was street driven and bracket raced quite a bit until 2004 or 2005, when it got replaced by a 446.
It was still running as good as ever and got sold.