Just remember to leave sufficient tire to body clearance.
My body is about 3" wider than the original Ts, so from the start I've been paranoid about that clearance while trying to set the body back as you are doing. I'm shooting for the top rear edge of the body being directly over the center of the wheels/axle...which looks close to what Conti's bucket is. I've gotten a 61.5" wide axle to help with that. On paper, with 4" backspace wheels, and relatively narrow 9.25" section width tires, there is around 3.75" clearance. With 3" suspension travel/articulation that quickly closes up to around 1.75".
If I remember right you are using an S10 axle, which I believe is 54.5" wide...a good bit narrower than mine, with what looks to be a good bit wider tire section width. If it were me, I'd test the suspension articulation with the body temporarily in place, before you finalize the body placement.