72 340 engine

hi i just bought a 73 duster with a 72 340 it was rebuilt it has a upgrade cam specs unknown, it was built to 71 specs,it has a 70 intake and exhaust manifold, a carter afb carb ,it has a steel crank the heads are 72 j heads.my question is if i do a compression test what numbers should i be looking for any guesstimates on hp and tourque