On one of the pictures I have of a RA V (Rodder and Super Stock )it shows a smog pump and all its accessories on the engine. It is setting beside another engine with all the smog accessories. Pictures show several engines.
Apparently Pontiac was trying to get it certified otherwise why put it on the engine. If they were trying to get it certified then it would make sense to put a code on the engine for future reference. The WY code shows here
http://www.wallaceracing.com/cgi-bin/engine3.cgi as a 400/375hp engine along with 3 other 375 hp engines.
I also have pix of the engine in a car with the smog pump/accessories attached.