Car left outdoors without the engine hood

Did you pick the car up and drive it yet? If it rained, especially if it rained a lot there could be some problems. The alternator shouldn't be allowed to get wet. Wire harness connectors, the distributor and ignition wires shouldn't be allowed to get wet. I clean my engine every 6 months or so at the spray car wash but I cover certain thngs with plastic. Usually if some wiring gets wet it's OK once it drys out. If you haven't picked it up yet and it rained on it you might want to bring it up to the body shop as to why they didn't keep it covered. Otherwise, drive it and see how it is.