GM of Canada documents are nice;
They will give you a "1 of" stat base on the more rare options;
It could be that GM of Canada has literature which suggests something along the lines of "1 of 160 W66/L78 cars sold in Canada with the ram air hood option".
And for those who need a brishing up the only year which a Ram Air engine was an option for second gen Formulas was 1970;
1970: "Ram Air 400" engine (RAIII) included a functional hood.
1971: The "ram air hood" was an option available exclusively to 455HO Formulas.
1972: The "ram air hood" was included no charge on all 455HO Formulas.
1973: The "ram air hood" option returned; unsure of availability, apparently 553 Formulas has the option; I suspect both Formula 400(L78) & Formula 455(L75) could have it.
1974: "ram air hood" option returned; some sources state only Formula 400(L78) could have it, but it is known to be factory equipmment on Formula 455(L75) cars.
1975: Last year of 1st design Formula hood; "ram air hood" option nla - dealer installs only.
