If you wire at 1 ohm and get the spider pack built 1 stiff and 5 medium you will be fine.
Mine already have a 'special' spider pack and the high-roll surround. I just worry about coils.
If it was my car, I would do a nice set of components up front and cut the 6x9 holes to fit some 8" subs. How much mounting depth is there in the 6x9 hole?