One thing you will NOT regret purchasing is a pair of AFCO double adjustable shocks for the rear. You need the ability to adjust rebound and bump independently.
The other thing that has been mentioned is a 30" tire. Very good idea.
How easily/smoothly does your front suspension work? Have you worked over the bushings so there is no resistance or bind? This is absolutely critical. Consider some Del-A-Lum bushings. Have you cut any coils off your Moroso springs? I would imagine that you have since you've got a SBC up front. Consider some Santhuff front springs.
www.santhuffshocks.com You're probably looking at 160 or 180 lb/in units. They will provide maximum weight transfer.
How much travel do you have up front? You need a minimum of 5". If you don't then you need to cut the upper/lower bump stops and get the car sitting lower in front.
Just a few things to think about.
What are your current ET's? What RPM are you leaving at on the brake? Based on your low 1.5x 60 foots you should certainly be able to hook consistantly.