Look for a Taurus 3.0 Vulcan, They were dirt cheap when I blew mine up, Local yards had Ranger engines that were $750 & up for 100K mile engines, (ridiculous). I bought an 07 Taurus 3.0 off a yard selling on ebay for $250, it had 20K miles and had a 6 month unlimited warranty on the engine, it was very clean, and they had not cut any of the harness, everything was intact on the new motor. When I went to pick it up they had it secured to a pallet and loaded it onto my trailer for me as well.
As long as you buy another 3.0 Vulcan, your intake, exhaust and accessory package will all interchange, You should swap the head gaskets to RWD model gaskets but I have heard of guys who did not and did not have any cooling problems on the FWD gaskets in a RWD vehicle. Like I said, I swapped gaskets, new head bolts, new water pump and I think I had about $375+ in an engine with 20K miles, ready to swap right in.
Good luck in your search
JP02XLT