I have never put weight in my chevelle. There are lots of rear suspension kits out there that will work sway bar antia roll bar a must, Untilll you free up up front end and gain travel you wont be happy. Take a look at tony janes car the red 68 lower body line and spindle and how it leaves. Iam only going 10.50s yet hook good. Trick springs are great yet Ihave 6cyl wagon spring cut 1coil plus 60 mil. Ball joint selection is key here along with control arm bushings. That said have 4 wheel alinment done by frame shop. Good luck