Just curious, do you have a name of who the "fellow" is that is coming to certify? If they are a true first generation expert I assume they will be checking to see what all is factory original to the car such as paint, original sheetmetal, interior and especially the drivetrain numbers. Checking dates and part #'s on items such as distributor, carb, heads etc. Also confirming the VIN and hidden VIN's for match, checking the trim tag to see if it is the original with correct paint, interior, build date compared to the VIN, possible X code (depending on the build date). Checking to see if all the typical factory Z/28 assembly items are there, dual exhaust, correct leaf springs, tach red line.
The list goes on and on....