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An engine designed to go flat-out for max two hours is a lot different than an engine designed to use a specified amount of fuel to go a specified distance for six, twelve, or 24 hours.
Right now F1 motors make what, 750 hp but only about 300 lbs-ft torque? if the new motor is anthing like the old, the car will be bog-slow off of corners. Also, how different are the KERS systems (which affect every part of engine and much chassis design)?
Would modifying the engine be cheaper than building two unrelated engines? Certainly (ref. Dr. Baretzky.) But it's far from just unbolting the motor form one chassis and bolting it into another.
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The 2014 F1 engines pretty much do have to run for 24 hours, as they cannot be changed - the teams in 2015 will only have 4 per season if memory serves, thats more that 24 hours per engine.
The new hybrid system is very potent indeed, the LMP1 regulations were specifically written to allow direct installation of an F1 power unit into an LMP. So yes its as simple as installing it. However I don't think an F1 engine will have enough power - we hear that the 2014 Toyota could have in excess of 1100bhp on full noise and huge torque (sounds daft but its true!)