Well you may want to make it wider with a-arms and an axle, although if you ride on tight trails that wouldn't be a good idea so that depends on what you do.
And then you can ether get some 450r shocks which will fit from what i have heard with just slight modification, and then get the 450r shocks and the stock rear shock re built and re valved buy a suspension company
Or you could go with afermarket shocks like fox, motowoz, axis, ect but not elka, most people will tell you that elkas aren't that great and i would agree with them..