The US version of KKvG was my first Godzilla film. I wasn't even in kindergarden yet. I knew KK because I had the original King Kong on tape.
I went over to my cousins' house and they were watching KKvG (the scene where G attacks the train)... and at that point I traded up. Your pretty cool Kong, but Godzilla is cooler.
When I came back home I asked my dad why we didn't have any Godzilla movies. The next day he came home with King Kong vs. Godzilla and Godzilla vs. Megalon on VHS!
I really need to see the original Japanese version, especially for Ifikube's original score.