Fastest ever conventional manual 1/4 mile......
You know, standard 'H' pattern stick shift, with foot opperated clutch, at least 4 speed. Can be modified/strengthened but has to retain those standard features.
What box was it? What car was it in? What motor? Etc. How long did it last?
For a street car i'm thinking it may be a rotary turbo.
For a drag car, who knows?