Hello, everyone.  My name's Gordo.  My dad and I purchased a CB750 in the summer of 1970 in Salt Lake City, rode it double back to Seattle.  I've had it ever since.  I'm terrible about keeping it on the road, although it's never required much work to run like a champ.  Anyway, what I've read on this site leads me to believe it's not a sandcast.  The engine # is CB750E-1033812.  What is the best source of info for parts and possible prices for a motorcycle of this age?  Thanks for your help.