I have two friends both with 79 firebirds that have pypes systems. One has a 455 (stock) with headers, x-pipe, and race-pro mufflers. We opted to put the mufflers on reverse so the exhaust flows into the baffles for more of a tone, but once we had the car running it was relively quiet. It has a good tone around 2k to 2.5k but other than that its kind of raspy and higher pitch.
The other car has a a 400 with headers, x-pipe, and pro-v mufflers. The car has a little bigger cam stock (something like 212 212) and sounds incredible. Nice hollow throaty idle, and a great loud tone under accel. I would recommend the pro-v muffler for tone.
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94 z28, bolt ons 
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