Trust me on the headers and exhaust. You will be amazed at the difference. You might be satisfied with that. Actually, you better be....headers and exhaust will cost you $400 easy.
The deal on the Camaro of that year is heavy and down on power. But what it can do way better than a Mustang is CORNER. Autocross your Camaro until you can do a motor the right way. You don't need the power as much for that.