At this point your only way to detemrine if it is a RAIII car is to find a build sheet or send off for the PHS Invoice. The only items that were distinct on the RA cars were:
Engine (WS on manual YZ on auto)
Air cleaner
Hood (scoops opened with cleaner boots and rings)
All of the formula hoods were the same basic part and had the scoop openings where the air cleaner would mate. The good part about this is that any 70-75 formula hood can be opened and have the boots added to make it functional.
The odds are against finding a build sheet in a Norwood car. It it is a Van Nuys car there is a very good chance of finding a copy above the gas tank.
Good Luck with your search!
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