Yes, I understand what your'e saying, but as I've understood even regular options function differently with a different model.
Since the 'Firebird 400' of 1970 came standard with a 3 speed Muncie, and a three core rad, anything more would have been reflected as an upcharge.
What differs model to model is if one 'charge' option requires another, just as you pointed out with the A/C option.
The one thing that really helps out with some cars, as 'Baron' pointed out, is if it was a GM of Canada car, in which case ALL rpo's regaurdless of them being a charged option or included, are listed in the GM of Canada paperwork.
I have both PHS & VVS (GMoC) paperwork for my car, and the '73 Formula that I had for a while.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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