i also had problems with my 1977 monza coupe installation
of carpet from ACC
i have done several other cars & SUVs with ACC Carpet before and
the fit was much better in those applications.
and the stamping or molding of the carpet was much better on those other cars too
the area i had the most difficulty was
where my feet rest in the driver side
it seems the carpet was not big/wide enuff to go down the side of transmission hump
all the way to the floor pan, because i now have a void or pocket of space
where my right foot is, i can barley operate accelerator because of it.
note: i did use a lot of floor insulation
to make it as thick as factory padding
but i still had the issue of poor fit in foot area.
i wonder if there is any chance my floor pan has the taller transmission hump
like the 75's had ?...with car makers in the 70s i think anything is possible.
ACC is a good company
but as with a lot of parts for H bodies,....their h body stuff leaves a little more to be desired,.....like correct size and fit !!!
dave in NC