Ultimate Motor Sports Went out of business I think. Your thinking about rebuilding a 1967 Mustang there is a much better chance to purchase one all ready done. Front rusting cowl and rust never sleeps in the torque boxes behind the wheels. Buying a beat up example will mean rotisserie rebuild and frame straightening and 2 to 3 years restoration time (unless your Chip Foose)
After you spend 35,000 to make a 67 mustang you slap yourself I could of Had a SVT 2008 Cobra with air bags big enough brakes to stop and full factory warranty for only $550 a month.
Ebay but be prepared to spend around $20 to $30 thousand on restoring it. If your not committed to that don't even start. To many older cars are getting trashed and junked because people don't have the money and know how on restoring them.