There are probably over 50 on shelves or in cars...there might be quite a few more, not sure what the early clifford run was like in the past...
I personally own one early clifford hpak (modified divided plenum for good midrange), one late clifford hpak now converted to EFI (yet to go on an engine), and one orignal Dutra Fat Pak(that's a pretty big runner cross section).
In comparison the Aussie Hurricane is a little shorter than the Clifford, which means it works at a higher rpm when/if it ram tunes...(At least
Dave M can run 13's all day on his with the matching headers... just remember to sawzall out all the extra webbing in the doors for weight savings on your valiant for best effect....
)-D.Idiot