Rear leaf spring recommendation for 67 Barracuda

ESPO.com (springs and things)
A 1 inch over bend is what I have used in the passed and that cleared the tire height. Your biggest concern is width. In jounce (compression of the springs and shocks) the tires should t stick out of the wheel wells.
Great info rumblefish
Did you have success going 1 inch over stock springs with a 15 inch tire? I thought I may have to go 2 inches. I dont want to over kill it.
Thanks