I would think they are ISO tapered as Stronglights are. You might need a slightly longer than normal BB spindle legnth like classic Stronglights do. Older Stronglights tend to work best with at least 118mm spindles as they must have a slightly deeper crank "dishing" than other brands do. (Typical 80's Shimano DA and Campys work at around 113mm). I mostly make this assumptions because classic TA and Stronglight cranks seem to have very similar characteristics, except for their puller threading specs.
Anyway, many suggest you go longer with the spindle because having it too short have less solutions to make it work.
Chombi
84 Peugeot PSV
85(?) Vitus Pus Carbone 7