The total horse power an engine makes is a moot point at best. By the time you factor in the horse power robbers like Ps/Ac,the charging system,the transmission,drive line,differential,over sized tires,what you have left is for the ground.Next you will deal with the tub you are pushing around,how straight the wheels are when you push it,the aero dynamics of a barn door or w/e.
Assuming the tune is perfect,,,,
maybe post some stats on the wife and what you have to work with and we can have fun with that too?
good luck with both