On later cars, bigger injectors will not help you until much further down the road. 84 I am not sure of though. Turning up the boost A Little, is generally considered safe.
Cams are a trade-off. If you have the T cam now, it's good for low end torque and up to 4500-5K, and then it drops off. Other cams will give different results, some with more midrange power, some spinning to 7K, but with an old motor there'd be springs to consider.
Stage 0, open the exhaust, turn up boost 3-5 lbs... of course your trans is in good shape, as well as your brakes and suspension.