Been down this road with 400's and these cams in the past. The 067 is great in the 350 Pontiac, but too mild in the 400, as you have discovered. The 068 is fine (still mild but not as mild as 067) and your brakes will have no problem either.
I like the Nunzi 2041 cam much more than the 068. It is a better version of the 068 but with higher lift and tighter 110 lc. If you tune it right, your brakes will be fine with this one as well.
I never liked the 744 personally.
BTW, Nunzi once told me the 067 in a 400 is like putting a "broomstick" in there!
That man has such a way with words!
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"Objects in mirror are closer than they appear" 