My son has a 67 Mustang with a 200 and stick in it and it gets 20.3 MPG and I have a student with a 77 Maverick with a 250 in it and he gets 21 MPG so if it were me I would drive it. They do make good racecars but the engine compartment gets small with anything but a 6 or 302 based engine. A 351W will fit but they get tight on the exhaust. We had one with a 347 in it with a true 10.5 that ran 10.20s on the motor with Cal Tracks and a decent shock on the back. No need for a big tire if the car works.