parking brake cable question?
 

how much longer are the parking brake cables on longhorns w/o th400 and w/o a BB than in regular longbeds w/ the same setup?

As far as I know, the brke cable is the same on all like wheel base vehicles regardless of engine/tranny combo.
Again, without any research, it seems the cable would be about 12 inches longer Than a longbed one since it runs from one wheel to the cab and back to the other wheel.

well in order to fit my super deep rims on my truck i had to drill out the E-brake clips on the trailing arms and move em back about 6''. So i need about an extra foot of cable and so i think im gonna go ahead and get one for a longhorn from LMC since they are like $9.

If that don't work, you can have some fabbed up locally more likely than not.