WC generally means it can have higher compression, which is good for FE. An extra cylinder/more displacement is generally bad for it. Of course, that depends on the power requirements of how you use/drive it. FI generally gets better efficiency, could make up the difference. As could the design of the engine.
Can't tell ya what's more important for you. FE? Power? Ease? For me, unless I was looking for a project, and if it was good enough as is, I wouldn't put myself through the bother of an engine swap. Diesel or electric swap might catch my attention more.
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