Here is a pic of a stock floor with no sub-connectors.. one of the weakness of a first gen Camaro is that the center of the floor has no bracing to really help body flex.. They corrected this problem on the 2nd gens..
Here is something that I am doing to help add stiffness to the center of the car.. This 68 already had DSE sub-frame connectors on it when it arrived @ the shop... so I added a convertible OE factory center stiffening brace that goes from rocker to rocker tied in to the sub-frame connector & a Hotckis bolt on brace.. We still need to finish adding the pcs to the sub-frame connector to rocker.. but I think you guys get the idea.. when done it should give it a triangulated effect on the center of the floor.. I remember this feature on convertibles from my days of restoring first gen Camaros..