The ‘74 Mustang II is in a class all its own. Even if it’s on a rebuilt title, you still might be able to get a car loan.
You should apply to several lenders to see if they’re willing to finance you. If they aren’t, you still have another option: a personal loan. With a personal loan, you don’t need collateral. You just sign for the amount you want, and the lender gives you the money. However, this is usually only available to people who have outstanding credit, and it comes with a high interest rate.