And if you want to do a v8 swap, the nsg370 is good for 279 or 289 lbs torque, so no bigger than a mb 5.0, a 5.5 if you know somewhere that can beef up the 6 speed trans from a jeep wrangler, then the engine swap is tuning to make run.
And there has been other conversion like a full hemi swap and a LS swap, full kit new ls computer and harness and all the goodies to have the ls run in a XFire will cost the same as just a tune to make a 5.0 mb engine run, but also have to change out gauge cluster, wiring, ignition etc.
As I said depends on budget and what you want to do with it.