I have found the #7038140 throttle plate was used on 1970 California Quadrajets only.
RamAir units has .123" holes in the throttle blades, .072" idle bypass air and shorter off idle slots than non-RA units.
Non-RA units has .093" idle bypass air and intact throttle blades.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
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