I've been reading up on diferentiating between the different VINs, X-codes and what not and I'm still a bit confused.  What determines that a car is 'matching numbers'?  How can I tell if my car is a 327/210hp or the 327/275hp?  Is the easiest way by decoding the Protect-O-Plate?
Also, in pre-'69 Camaros (ie '67 and '68) is it true that nothing more than a 'date correct' match can be made for the engine/tranny?  I've been trying to read up on 
www.camaros.org, but the site is poorly layed out and confusing.  Can anyone help by answering and/or giving me another source?
Thanks in advance!
-Daniel