If all you really want is a 5.0 coupe, then just buy one done. Just like Tommy said, if you buy a nice coupe 4cyl, and buy a cheap 5.0 something to swap everything over, you'll end up spending more. The cheap donor will most likely be beat to death.
We should've done a 4cyl car for Wendy, cause we spent good money for a good coupe and in the end the only thing we left alone was the int and paint. You name it, we changed it. And that's why my zephyr is a 6cyl and will all be changed.
john
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handle every stressful situation like a dog: if you can't eat it or play with it, just pee on it and walk away.