new to the form . have bought car 1256 still has only 18000 miles on it .however it was caged and raced many years ago. i am and have been a buick gn owner since 1987.still have my original 850 mile gn. the tta is in need of the entire drivetrain, not sure if i want to ls it or try to put it back to stock form. any parts or parts cars available?