You would do pretty well against him on a high speed track. You would do especially well against him after more than 1-2 laps on a high speed track
Other than that, he will be faster almost everywhere.
This is all assuming everything works perfectly on his car and that is a rare thing with a heavily modified rally car. He will also be working his ass off driving that car at 10/10ths while you will be sipping your Starbucks coffee behind him.