I am converting my 3 speed column shift to a 4 speed floor shift (automatic - 200-4R). I am considering 2 different B&M shifters. What is easier to install on these cars: 1) A cable that exists in front of the shifter? OR 2) A cable the exists in the rear of the shifter? I am thinking on the QuickSilver or SportShifter. How far from the firewall should I drill the hole for the cable to pass through? Any advice would be of great help.