The best production numbers source I know of is in the book, "The Definitive Firebird & Trans Am Guide 1967-1969" by Rocky Rotella. That book shows that there were 87,708 total produced. (pg 182) 11,649 were converts. (pg 125) The engine/trans production numbers show 939 total 400HO with M20 4 speed man and 113 with the M21. (pg 182) There is not a breakdown how many went in coupes vs converts.
