Darien,
You probably didn't get ripped off, but you may be into this another 3K$ before it is right.
Mopars of that period all had a dreadful cross-fire problem.
First, Check the firing order from at least three independent sources.
Second, Check the dress of the spark plug wires. If 5 and 7 are anywhere near parallel, move them. They can cross, but even try to prevent that.
Driveline and brake parts should not be difficult to get - yet, but make friends with online suppliers because your local parts store won't be much help. You had best know what you are buying parts for by base numbers.
Count on all the rubber being bad. AJ mentioned tires, and that is just the start. If it is rubber, replace it. This also includes all the fuel lines underneath. All of the rubber. And flush the brakes with new fluid too.
Your entire fuel system should be carefully inspected. It was not made for and the engine was not calibrated for the Crstuff that passes as motorfuel these days. Yes, the carburetor will need to be gone through and all its internals replaced with crapalcohol tolerant materials.
Good Luck Guy
Matt