Here is something interesting. Apparently everybody was confused. The car never had a 3 link in it. It was never even backhalfed. It had the original rails modified and the springs moved in,and later the ladder bars and coil overs installed(before 1975 though).The original rear rails were cut where they kick up over the rear,and removed,then the right rail was put on the left side and vice a verse. It moved the spring mount inboard. hey installed 3x3" frame connectors thru the floor with the springs mounted off the back of them just like modern frame connectors. It has the original outer wheelhouse,only the inners were replaced with tubs.
This is the trunk tin work with the 79 rear treatment still installed. The weight bar was used to meet legal weight with a 427 big block.
Before being sold from SRD in 1975 the car had a Lenco in it,and had a very large section of the tunnel removed.
The door hinges were apparently too heavy,and that needed to be addressed.
Apparently the gas,clutch and brake pedal brackets were all too heavy as well. And the inner cowl area must have weighed a lot since it was removed and the pedals and column mounted to the roll cage.