I just purchased a junkyard mark viii engine from the junkyard. Its a complete engine with all wiring and accessories. It looked good from everything I could see while it was sitting in the car. I plan on doing cams, long tubes and a 96-98 cobra intake manifold on it. What should I do to check to make sure the the engine is good? Do I pull the heads and remove the timing cover on it? What have you guys done to make sure that its good?