Wow, thanks for the welcome and all the insight.
One question though, how important is the numbers matching thing to the cars investment value? There is currently a 1970 Monte on eBay (http://www.ebay.com/itm/272338593627) that is all original (with build sheet and lots of other documentation) except the motor. The seller claims the motor is a crate engine that was replaced, under warranty, sometime around 1972. This car is identical to the one I had in HS and looks to be really complete but definitely needs work. I think this car just needs mechanical and body work to be very nice. These are things I can do (and enjoy doing) and sense the car is so complete, I wont be burning up a lot of time tracking down parts. I wonder though how much the non-original motor would that affect the investment value of the car.
Steve