Hey yall...I have a question regarding the body/chasis/suspension on 68 Firebirds between the different engine options. I know that the 67 Firebird came with mono leaf springs and depending on which engine/transmission received 2, 1 or no factory traction bars. I also know that Pontiac switched to multi leaf springs in 68...I was wondering if there was any differences between the suspension, axel, chasis, etc. between an original in line 6 car and a 400 car (both with 4 speeds)? Thanks