Welcome to the forums, Elliot. Your English is just fine. It's always great to see foreigners have a love for American cars as well I think. I say go for the 66 Chevelle if you can. 66 is my favorite year. However, there's nothing wrong with a 71 either. Good luck to you.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
If I was just choosing a Chevelle --- and I was on a budget --- I'd research to find the year that had the most parts available for it. Maybe in the '66 to '71 range they're no different. They are a popular car here.