Make sure to not let any crap fall into the engine. You will have both the front and top open and will have a lot of gasket clean up to do. One work of advise is to just throw away the front an rear intake rubber gaskets and use a nice 1/4" or so bead of RTV black or blue. Clean everything well before re-assebly. Use Quality gaskets, cheapos will end up costing mre in the end. Follow the breakin instructions for the cam to the letter. It is real important to get the engine started with minimal cranking so make sure the distributor is close enough to start right up. It is a big job to change a cam, not hard but a lot of stuff to take apart. You usually will need to pull the radiator and condenser (if equipt)also.
good luck and let us know how you make out