Great advice above
The D15b7 isn't the ideal engine to make more power from, unless you're looking to spend a lot.
There's 3 options...
1. Mini-Me (vtec head, intake manifold, ecu, plug wires, timing belt, maybe distributor depending on the head you choose) Also convenient to do at the same time as a water pump. Cost a few hundred bucks and you be around 130 HP, depending on the compression of the head you use.
You'll also have a fresh timing belt, water pump & plug wires.
2. Nitrous. The best bang for the buck on about any motor.
May not be the best idea on a high mileage motor.
3. Turbo. If you do your research and understand you a turbo system works, you can piece together your own for cheap ($1k) although at that point you aren't far from the cost of a complete B series swap. A home made turbo may not be the best idea on a high mileage motor.
If you're getting a 5 speed and want your car to accelerate quicker, be sure to get a tranny from an EX or Si. They have the shortest gears.