looking for 360

If it was me, and looking for a drop-in, I'd be shopping for a Magnum. And if you're going for performance, I'd grab an A500 too. Then you can finally run those 3.91 s
Of course a 318 Magnum is no slouch either, so you can get a teener/A-500 out of an older Dakota, or a 360/A-518 out of a Durango. Neither of those transmissions will fit tho without modding the tunnel. Trailbeast has put one in, and I think he has a thread on the how-to.He makes it sound easy.