Suspension

I'm am soon getting ready to take my 73 Challenger off of the rotisserie I made and get it rolling again. I had to cut the rear leaf springs off to get the read axle out so I am looking to replace with new springs. I think they were origional springs.
I am a novice :glasses12:. My goal is to make this car look nice, ride nice, sound nice and be solid only, and hopefully keeping within a reasonable budget. My question is
1)where is a good place to purchase some new leaf springs and
2) is there anything else I should think about upgrading from a standard suspension that would be crazy NOT to do while I am at this stage while trying to keep within a reasonable budget.
I am planing to fab up some frame rail connectors this weekend but not weld into place untill car is back on its wheels.
Thanks so much for your help!!!Name:  015.jpg
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Author: Bill