To get a classic car loan, a lender will decide if the car qualifies based on its mileage, condition, and other attributes. If the GTO has been meticulously maintained, you should be just fine. Apply for the loan just as you would with any other vehicle and always make sure to shop around for rates. Some lenders specialize in classic cars, so that may be a place to start.
If your car doesn’t qualify, you may also want to consider a personal loan. The interest on a personal loan is much higher because nothing is held as collateral, but it’s not a bad deal in a pinch—especially if you make extra payments to the loan to pay it off early.