Thanks to Jon for directing me to this very insightful thread. These forms make for interesting reading. It never ceases to amaze me the quality information on this forum.
I know I'm going to sound like an idiot for asking this, and I apologise in advance for doing so, but other than the image of a small block Chevy cylinder head on page 3 of the forms, where on these forms does it say its legal to fit a Chevy motor into a Pontiac? Eg, if I'm a scrutineer at a 1968 T/A event, where is the proof that the Chevy motor in Craig Fisher's Firebird is allowed to be there?