3400 injctors

[BerettaZ26]

I'm going to the junkyard next month to get my upper and lower 3400 manifolds, do the injectors flow any diff. than the 3100?
I don't really know that much about the 3400 or the swap so if somebody could give me a quick lesson on y this set-up is better than keeping the stock lower and uppers it would be greatly appreciated.
Thanx.