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Hi,
from a race team perspective i think you're right. Race engines are periodicaly revised. But that means the race engine is rebuilt completely. And this is done because it's cheaper to rebuilt a running engine than to rebuilt a broken engine - engines can fail at every time - even newly rebuilt ones. But that also means that the engine you put in needs to be completely revised / rebuilt on a professional level.
Engine swaps can always make problems, because peripherical parts like hoses, clamps, plugs and so on can fail. Because your car is 10 years plus old and materials deorientate over time and heat cycles i would also take this into consideration. Also you have to setup the car completely after a revision. So i'm shure there a lot of things that can make a swap more time consuming / expensive than one think at first sight.
Because the car is old and the engine is also old i would go the preventative line - if i would have the time and budget.
Regards, Markus
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