I did a search and I cant find and answer either way if blue and silver injectors are stock or not. On a 91 305 tpi S/D. thanks

That looks like a GM injector. As for if it's the stock injector for that car, I can't say.

anybody know for sure or have other guesses. thanks.

Looks like the GM multecs they are chevy injectors and they came on camaros but i think they are 21lb injectors, 5.0L should be 19lb.

From the picture I can say they look EXACTLY like the stock 22# GM Multecs I used to have in my L98.

What those are, their rating, how old they are.......I can't say.

wouldnt 22# injectors make a 305 speed density motor run like crap?

To be sure you could check the numbers, but they do appear to look the same as my 22# GM injectors. Here is a pic of mine- one is a newer change up but still 22#.

I'm giving the numbers here for you, too. Hope this helps. Jim