Hello , looking for suggestions

I have a 2001 ranger 4.0 4x4 that I’ve owned for the last 8 years or so and I love the old thing . It is well over 300 k miles and still kicking as strong as she can . I was always wondering about doing a V8 swap . I’d love have her on the road for more years to come with more power . I’d of course rebuild any donor engine I pull before putting it in my truck . What’s the best and easiest engine to swap into it ? Explorer of the same year ? What’s going to be the big challenges ? Or on the other hand is it just more feasible to run her the way she is till she gives out ? Money is not an issue , but only have weekends to do the project . Would it take me months ? Thanks for any advice or suggestions . Just looking for someone who has done it with there particular year ? I’m guessing I have to use donor transmission as well ? I’m