Mopars are spendy but Id say in my opinion and I dont know what things cost in your area but the A body 4 doors pop up with 318s in them from time to time for under 10 grand. Id take one and cruise it like a 74 Dart/Valiant 4 door with the v8 drivetrain. Then swap something in later like a 360 or a magnum. Not telling you what to do just tossing ideas. A Duster or something more popular is usually a rusted hulk going for top dollar and you have to tow it home...