Mine was running about 1,000 rpms high at idle and when I would accelerate, it would begin to jump around. I'm not experienced enough with troubleshooting tachs to know if the symptoms you're experiencing are a calibration issue or filter issue and the last thing I would want to do is steer a fellow camaro comrade wrong. If you know someone who has a filter, maybe you could borrow it and test it out first. If it doesn't work, at least you can get the benefit of narrowing down the problem.
69 Camaro Z28/RS, Hugger Orange w/ White Stripes, Chambered Exhaust, Endura Bumper, Protect-o-plate, Original Window Sticker