Well, in my experience, the cars come complete with no imediate problems. I had a coolant leak and
oil leak in the first 500 miles. All fixed by just re-tighting the offending clamps. My TKO-600 was a little stiff for the first 1000 miles, but has broken in nicely. You may or may not have to tune the motor for your area...if you have a carb. Other then that, just have fun and watch the garage for the leaks if they appear.