DSL, having one in my car,I fully understand your caution, but the key word in your post is "installation", the more power you seek to extract from any engine, the more crucial the surrounding parameters become.
Bike derived engines can be just as reliable as anything else, at comparable power levels to "normal" engines, and beyond, providing the installation is correct, but they do tend to require a lot more attention to detail.
I suspect the same would apply to a Duratec at the power level you seek.
Edited by - Mike Biddle on 5 Nov 2012 18:13:54