I just bought some new injectors off ebay for my NA 76 280z. 5 of the injectors have nothing in the shaft, but one has a white thing inside. I have attached pictures. Which style is correct? Should I take the white thing out?

The bottom of an OEM 280Z fuel injector doesn't look any thing like that. The pintle on the bottom is different and there's a rounded plastic cap that covers it. I can take some pics of a stock injector if you'd like. Not saying that those you have won't work but they're not OEM injectors.

On a spare intake I had I have seen the pintle style and this style. I guess it will work OK. But I am wondering now if the pintle style is better.

I don't know as I've never used anything other than OEM.