It depends on your long-term plans for your Jeep. For example, mine is a keeper, so I consider it worthwhile to have spares and spend money on it.
With the mileage on yours, you're going to be doing injectors soon (typically around 250,000). If it's a keeper, then the spare engine might be good to fit when your existing one gets smokey, so keep it.
Ultimately, only you know.
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