I'm in the process of linking the front of mine with a waggy 44 and was under the assumption I'd have to get the astro box. It's sitting on the factory leafs for now, but I pushed it out 6" and rebolted it to the springs. The steering gear output is centered directely over the tie rod. So the way I see it the drag link would have the same angle weather it's to the rear with the factory box vs. to the front with the astro box and IMO it's better to have it tucked up behind than having the pitman arm hanging out the front and getting snagged.
Maybe it's the way my 44 is set-up but you may want to see what it looks like with your axle pushed out to where you want it before deciding which one to go with.