'74 Duster suspension suggestions

Hello, New to A bodies so I have some questions on the suspension set ups you folks are running.
We just bought a '74 318 Duster with an auto and are trying to decide on the suspension set up. It will mostly be a weekend driver however it will see the track fairly often. We want it to really perform well in the 1/4 and believe it or not intend to build the little 318 since it is a numbers matching car. (shooting for close to 400hp)
First of all for the rear. SS springs both left side ones to keep the rear end look even? How bad is the lean with both 002 and 003 springs? I noticed there are also coil springs back there. What are they for? I don't see where anybody replaces them. They look pretty shot as well. Finally for the rear, what good launching shocks?
Now to the front. I don't see many talking about drag shocks on the front. Is that what we should run even though it will be street driven or are 90/10s just too much? What shocks are suggested for a good launch and ride? Thanks!!