Dyno number are just that, numbers. The are really only good if you use them to reference your own cars gains, when using the same dyno. You will find they can vary a LOT between diff ones: Mustang, Dynojet, Dyno Dynamics, etc... Some setups even have auto correction for weather (temp, humidity, etc). So comparing 2 cars dyno'd on 2 diff setups is apples to oranges.

FWIW, 350 to the wheels is a very good number.