is it an amc 360 or mopar 360?
the transmissions from an inline 6 xj would work with the amc 360 but i think the only one that would hold up would be the nv35xx or the aw4(which is out of the question since you want a manual)
if you find a bellhousing for a SR-4/T-4 it will work with a T-5 from a ford. and you should be able to find a ford truck with a T-5/trannycase pretty cheap they are a dime a dozen. IIRC advanced adapters or novak makes a kit to adapt the 231 to the T-5
if your going mopar 360 id say go with a NV4500
either swap will not be done cheaply IMHO