I did the 5.9 magnum swap into a 65 b body.
but it came out of a durango.
the 5.2 is same dimensionally as well as mounts and oil pan.

you need the 360 LA oil pan and gasket set with pickup.

I used my old 727 since it was easier then figuring out the controler for the 518.

BUT since you are keeping the old ecu and stuff, I think you have to go all or find a manual ECU so it doesn't trip codes if you keep the old 727. plus you would have to notch it so you can keep the crank sensor.

you can use the old 318 mounts and a spacer if you want. or as someone else said shcumaker mounts, which is what I did.

I used the durango exahust manifolds.
they worked just fine and cleared everything.

no idea on the jeep thing.