Hooker does make headers for you that do work, just not in the Super Competition variety.
Get their "Competition Headers" instead of the "Super Competition headers".
The only difference is the comps have a slightly smaller primary, are a bit heavier than the super comps and are alot cheaper.
Trust me, these'll do the trick for ya.
Hooker Competition header part # 6913 or (6913-1 if you want 'em ceramic coated)
...and yes, they'll fit your 2V heads and will fit with the C6 in place.
Link to their Competition header page is:
HERE