You need a testbed prop, as advised above. Some form of ring cowls and cylinder baffles are vital to maintain proper cooling or you're going to have problems in the future. You'll also need the following minimum instrumentation as well as an oil cooler and exhaust collector ring:
Tacho,
Manifold Pressure,
Oil Pressure,
Oil Temperature,
Cylinder Head Temperature.
Note - overboosting (excessive manifold pressure) will ruin your engine if it's supercharged. You really need to understand the principles of blown aero-engine operation before you run at more than low power.