I am no pillar of memory these days but have a library of books from back in the day and the stuff that I trust shows WQ AND YW as the HO motors. Here is a list that references some of the books that I have https://www.facebook.com/groups/161277239570/permalink/10159091912669571 If your just getting into Birds you need this book https://www.pontiacv8.com/shop/the-definitive-firebird-tans-am-guide-1967-1969 It has all the codes and tons of info on our first gens. I have read this through a few times and I could only find a few small unimportant errors, It's a good reliable source by a fellow Pontiac enthusiast.