First thing you need to do (or already know) is assemble the front suspension without the springs or shocks; you should be able to move the spindle from top to bottom with no binding and no more effort than what it would take to lift the part's weight.
In the OP's case, he needs to find if the aftermarket arms are designed to run stock springs or a different diameter/length. Once he finds out what springs are OK, then he can continue. Assuming stock is fine, then he's in the same situation as the rest of us, where you need to remove a pile of coils to get adequate ride height and suspension travel. I have at least 2 coils cut off of mine, but it's no longer street driveable. (insufficient compression travel) I have cut the springs at least 3 separate times. (along with the cuts have been front weight removal so be careful here)
It sucks re and reing the springs, but at least it gets easier as the coils are removed.
My car has an inch between the compression stop and the control arms. You get a pretty good look at the car at rest in the vid in my signature, and the front's are 28" tall, required to keep the crossmember out of the track surface.