From my experience, I've found that Pontiac used windage trays up through the mid 73' model year when they went to the lower oil dip stick tube with a strap that attached to the #3 main cap. Prior to that the lower tube was held in place by the windage tray
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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