I don't know if it was ever run in a car or not but BES made a 712 hp 401? under 6500 RPM with one carb. Throw out the RPM limit and low speed TQ requirements of engine masters and it should not be that hard.

While a bunch are not yet retrofited in old lightweight muscle cars or race only cars they are running really impressive ET/MPH considering the 4500 Lb modern tanks that are out in mass.

Even the lowly 2008 345 HP 5.7 cop car responded really well to a real exhaust and long tube headers. It went from tire chirping to endless tire frying with zero other mods, unfortunately we have no drag strip around here to measure precise improvement on. The bigger motors with bigger heads should see similar or even bigger gains.