Derek, I'm getting ready to install the rear boxed control arms and rear sway bar, and I want to replace the rear springs at the same time.

I'm near Speedway Motors on a biz trip, and thought I might pick up a pair of springs while I was nearby.

Question: What rate rear spring do you recommend for my '72 with the stock boxed arms and sway bar?

Here's a link to the web site page that lists the spring rates in the pull down menu.

http://www.speedwaymotors.com/Eibach-Rear-Racing-Springs-5-Inch-x-11-Inch,268.html?parentDisplayId=38121

If I drop an inch or so in ride height, that is probably o.k.  They have an Afco front/rear kit, but it's only for a SBC.

Appreciate your thoughts on this.  Thanks.

Got it.  Thanks Derek!