here are the factory set ups for small block. orange is 4bbl blue is 2bbl. Lower rod and lever are different and the upper rod and cable bracket are different. The one piece rod set up will not work on an A-body or 70 on back B-body due to the firewall being to close. That one piece set up is usually found on 71 up B-body , E-body, C-body,or truck.