Answer: there is an obstruction in the exhaust system.
You can swap a 1997 Mustang V6 into a 1968 Mustang. You will need to make several modifications to the 1968 Mustang.
Nick Jonas' Mustang is a 1968 Ford Cobra Mustang
The 1968 Ford Mustang 6 cylinder produced 195 horsepower ========================================================= In a 1968 Ford Mustang , the 200 cubic inch inline ( straight ) 6 cylinder engine was rated at ( 120 horsepower )
The last year a Mustang Fastback was made was 1968.
On a 1968 Ford Mustang 200 cubic inch straight 6 cylinder engine the points are gapped at ( .027 )
There is no evaporator on that model.
That was a 1968 version
60 Minutes - 1968 Power to the People The Stone Box The Toughest Race 37-26 was released on: USA: 27 March 2005
60 Minutes - 1968 The Price of Bananas Brain Power Swimming with Sharks 41-43 was released on: USA: 9 August 2009
60 Minutes - 1968 Coming Home Sergeant Bill Brain Power 41-6 was released on: USA: 2 November 2008
60 Minutes - 1968 The Age Wave Montana Power Addicted to Orchids 35-45 was released on: USA: 10 August 2003
60 Minutes - 1968 Medical Malpractice Imported from India Pork Power 35-38 was released on: USA: 22 June 2003