Please help me interperate this cowl plate
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GENERAL MOTORS CORPORATION

172 05D
ST 67-22667 LOR 7487 BODY
TR 259-Z Q-2 PAINT
WD 2W GS
Q4 5Y

BODY BY FISHER
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This is new to me. My wife bought it new in Chicago in spring '67. Some numbers I have been able to research:
rt. front E.block; 593514 YJ .Intake M. front; E 117.
Firing order 18436572. Intake M. rear; 9782894.
What I don't understand and can not find is the reference to WD 2W GS; Q-2 (Q-?); and Q4 5Y.

I am on a hunt here and will be asking for more help .
Thank you in advance.
Snowshoes #1976