Ok I've searched but I still can't find the answer. What is the spring to use for a all iron big block in factory gear with 15 x 7's up front ? Has anyone tried the moog 6320's? I don't want the nose up look I have the original 5 leaf springs in back with stock shackels. Thanks

Ok, what springs has been used on a iron head iron intake no air big block car with 15"s?

Chevy had a dozen different spring combos for our first gens. If you buy an off-the-shelf spring you may get lucky and get he ride height you want.

Or, you can call these guys:

http://www.eatonsprings.com/

They'll ask all about your car and make a spring for your application. I highly recommend these folks.