http://www.springsnthings.com/

Here the link to ESPO springs. Never used them so I have no opinion on how good they are. Have used SS Springs from Chrysler, the older ones lasted with no problems for years and the old springs never relaxed in their height, they were in my A12. Pulled the ladder bars and slider kit out of the Challenger and put a new set of SS springs in the Challenger and they have lost there height very quickly, with in a year. I do not recommend new SS Springs. Using SS Spring you will need the longer front spring hangers. One thing I like that ESPO says in the write up is that the springs are matched in height and that is good for your application being an automatic and small block. There is one other way to go by using the stock springs that would of come on a Hemi or 440-6 car and having those springs redone but you are taking your chances on older springs and the people will set them to the proper ride height.The stock spring numbers end in 024 and 034.

The Air shocks, like said above by Erik toss them, buy shocks that are good for your applications and do not alter your spring height and make the springs non effective on acceleration.