BaZ, according to my old Chilton's Mustang guide, a Q code for '73 is a 351 Clevland, 4-V, HO. In '69 and 70, the Q code meant a 428 CJ. As you can see, in different years the same letter might mean different things. Hope this helps a little. Have fun with the new old Stang what ever you end up getting.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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