Hmm. Interesting.
UltimateGTO.com does in fact show a zone/dealer 99 998 "Pontiac Motors Racing Division".
I had never heard of it before; the '63 SD cars went to 35-997 Pontiac Motor Division Engineering.
Are there any other notations; perhaps "Tag - " and then a name?
Quote:
Originally Posted by johnta1
Can you post your PHS?
John V could probably explain it better than I could.

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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.56 @ 139 mph best
http://www.superchevy.com/features/s...hevy-chevelle/
My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524
"Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926