Going by memory, but I believe my 95 Acura Integra LS is at around 3,000 RPMs at 70. 4-speed automatic. 1.8L I4, 142hp.
I can't remember what the Firebird is spinning at 70mph. I know it isn't nearly as high as the Acura. Probably around 2k. I'll follow-up with a correction if I'm way off. Also a 4-speed auto. 3.8L V6, 200hp.