help!! headers for 67 stang w/gt40 heads

changed from standard heads to gt40's, now my origional headers fit
but no clearence for spark plugs
. any body ran into this before??
what headers can be used on a 67 w/ gt40 heads??
thanks,
nabber

have you checked with summit racing

Sounds like you got GT40P heads, that require special headers because of the clearance problems with the spark plugs.