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RE your questions: Depends on whether the intake manifold is the lower or the upper. Upper on L36 engine, maybe 2 or three hours. Lower, about an hour longer. Chilton'* 28200 will tell you how to do it. About the same time for the L67 (supercharged), but you are removing a supercharger instead of a plastic UIM. Many here have done this work. Use the search feature or follow the links at the bottom of this Techinfo article for more on L36 manifold work:: http://www.bonnevilleclub.com/forum/...e=article&k=38