As a way to help you diagnose the brakes....... when the hydraulics are good and the shoes adjusted properly, the brake pedal will be very hard with the engine not running and the vacuum out of the power booster. Should only drop about 1" when you push the pedal hard. If it drops low or continues to drop with steady pressure you have a leak or a failing master cylinder. As mentioned, all the parts are available and cheap.
As for what the car actually is, most likely a Catalina convertible. It was common for owners to change out the grilles, and taillight panel and make many full size Pontiac's "Grand Prix". I have a friend with a 66 Bonneville convertible, "Grand Prix". I have seen dozens of them. VIN will tell you right away or the title.
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