1963 chevrolet biscayne Bel Air Impala 62 64

1963 Chevrolet Biscayne drivable project with a 350 engine and 3 speed manual (3 on the tree) transmission.
I took this car as partial payment on a pickup I sold a little over 2 years ago. My intentions were to fix it up in my spare time and I have done some work on it but don't have the time or money to finish it.
I replaced the 6 cylinder engine with a 350 from a early 80s chevy 4x4 but after having new dual exhausts installed the engine has a rattle. It doesn't sound like a rod but more like an exhaust hitting on something. I can't find anywhere the exhaust is hitting...I don't know.
To avoid misleading anyone, please assume it has an engine rattle.
Car has new dual exhaust, new tires, new carpet, new trunk and door seals.and starts, runs, stops.
I have driven the car on the street in this little town I live in but have never had it on the highway.
Again, this is a project...lights, wipers, fuel gauge, heater etc.. all work but it still needs cosmetic work and paint on the body, seats recovered, and headliner replaced.
I have a clear title in my name.
Mileage listed is what odometer shows...true mileage is unknown.
Car is located in Westphalia, Missouri (about 17 miles SE of Jefferson City) and if you would like to look at it and hear it run email me (ask seller a question) and we can set up a time for you to stop and look at it..
Look at the pictures and bid accordingly.
Car needs to be paid for and picked up within one week of auction ending unless other arrangements are madePRIOR to bidding.
Pick up and/or shipping is the responsibility of the buyer.
Car is sold AS-IS with low opening bid and NO RESERVE!!