Replacing Leaf Springs

I am looking to replace the leaf springs in my 69 Dart. I was thinking of just putting new OEM style springs in to maintain the stock stance of the car. If I go with OEM leaf springs, where is the best place (vendor/retailer) to get those parts? If I wanted to raise the rear up possibly an inch or two, what leaf springs would be best to accomplish that task and where would be the best place to buy them? Thanks.