The type of chassis dyno I was on was a Mustang dyno (nothing to do with the Ford Mustang) and did as many real driving scenarios as possible. The O2 sensors were essential for this. We looked at how the motor was behaving, air fuel ratios, etc, while going through gears not wide open runs. The Mustang dyno is much better for this than a Dyno jet. Your peak numbers at wide open with a load will be lower than the guys quoting numbers off a Dyno jet, but it will be more realistic and some will argue more accurate numbers.
If you can find a shop willing to do this, I reccomend it. I got to be right in the shop with the car and it was a fun experience. We did quite a few carb adjustments and played with the distributor too. We didn't get it perfect and to do so I was told the Quickfuel carb would need some off the car further adjustments. I did, however leave the day getting more usable power while burning less fuel.
The shop guys loved learning about the Pantera, while at the same time hated having to contort their bodies for distributor and carb adjustments. Changing a spring in the distributor while the decklid is still attached is not easy.😀