b&m shifters & 8 3/4 rear ends

2 questions i have a 73 duster with 360 and 8 3/4 open end, first i want to take automatic shifter off column and put b&m shifter on floor i am thinking of zgate or starshifter, any other ideas on shifters and are they hard to install, also want to change third member to suregrip are they hard to install and any special instructions, plus if anyone has one let me know? thanks