Camshaft/Crankshaft question

I am rebuilding the 318 5.2L in my Jeep Grand Cherokee and had a question about camshafts & crankshafts. 1st - I wanted to know what the Basic operating range of a camshaft means? The one I'm looking at says 700-4800. 2nd what is the stroke on a crankshaft? The one I'm looking at says 4.00. Thanks - Matt By the way this is more of a general parts question so no knowledge about 318s is necessary.