Caterham used them for years and years so I don't see why you can't put one in a roadster. There's even a turbocharged version if you want to go nuts, and you could probably pick that up cheaper than a duratec.
Also, do duratec's require aftermarket ecu's etc to work, I'm pretty sure the k series doesn't.
Another thing in the k series favour is that it can be made to run very well on Weber dcoe (twin sidedraught) carbs.
The head gasket will only break if you don't look after your engine.
Basically I think it comes down to budget, K series is plentiful and cheap, Duratec isn't.
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