what springs and shocks for my 8 3/4???

I am planning on starting to tear out my 7 1/4 this weekend on my 70 swinger with factory 318 and 904. I want to order new springs and shocks for the rear end so i can get my 8 3/4 rear into the car in a timely manner. I am just curious where might be the best place to buy the springs and shocks and any specific type that is the best for the money??? Shoud i be buying air shocks?? Im planning on putting a stroked 318 back into the car and planning on around 350HP and using 3:55 suregrip on the rear. I will be only using the car on the street no plans for the drag strip thanks for any tips/info.
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