To get it correct you will need to return the suspension to stock or something close.
Spindles and Spring, check the upper and lower control arm bushings as well as the upper and lower ball joints. The bubble top upper ball joints are available and there are companies who will rivet them into the original arms.
If the car is a Double Copo, has the Sports Car Conversion (140 speedo, 15" wheels larger sway bar) as well as the 427 mill it would have the YH ralleys like a 69 Z28. If not it would have had 14" steel with a dog dish, or other optional wheels.