Fuel Injection in '68 ?

I was thinking about it at finally had a search over Wikipedia, and I was wondering :
Why does fuel injection appear in game un 1968, while Chevy introduced it in 1957 ?
I don't know if it's a different thingy, but if it is I'd like to know if it will be in game or what it is if it's already in, but under the Carburettors... (I doesn't make sense to me)
Why does fuel injection appear in game un 1968, while Chevy introduced it in 1957 ?
I don't know if it's a different thingy, but if it is I'd like to know if it will be in game or what it is if it's already in, but under the Carburettors... (I doesn't make sense to me)