What suspension upgrades should i do for $1200 big block dart

I've seen some mixed reviews on them in the past. The most recent installs using the Hotchkis springs seem to be better, maybe they sorted some things out. Ride height will be pretty low, I think @MuuMuu101 is the most recent person to use them on a build. This is the ride height on his car.
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Yeah, I like the way it sits and how it rides. I haven't had a problem with them yet. I got mine from Summit back in late 2014, early 2015. A lot of people claim they're too low, but I like them. If you're running 15" wheels with a tall tire you may have problems with rubbing when the tire flexes. My sidewall is pretty short so I don't have that problem. I may go to composite leafs in the future, but we'll see.

@72bluNblu, don't you have some AFCO springs from summit and don't they come in two different stiffnesses? The less stiff one may be better for the OP.

For $1200, I'd probably do MOOG offset bushing, welded in subframe connectors, Bilstein RCD shocks, and Hellwig sway bars front and rear. As mentioned before, your tires are your limiting factor.