Just from an overall performance standpoint the 69' charger still blows the 82' firebird out of the water. 82' firebird was 0-60 in 9.2 seconds stock. The 69' charger was capable of being a 6 second car w/ upper ranges at 7 seconds for the standard R/T. That's a full 2.2 seconds faster from 0-60. Throw a HEMI in that bad boy and you can drop that even further to 0-60 in 4.2 seconds. All souped up, it's a hell of a day and you would be a savant of automobiles if you can get the firebird below the 5 second mark.
Quarter mile the firebird is a 12.5-13.5 second car. You have to fuck up a Charger and be terrible with cars for it to not run under 12 second 1/4 mile without really breaking a sweat. Normally I'm a fan of turbos tbh, but not even the turbo in the 82' firebird helped it accelerate faster than the 69' charger.
Top speed the 69' charger was clocked at 205mph, for the firebird it was at best 160, and you could maybe marginally stretch it further beyond that by tweaking gear ratios.
The only thing the firebird outdoes the Charger on is in the realm of drag coefficient, cause a .33 drag is wtf ridiculous.