305TPI to 350TPI

[ArticWhite]

I am swapping out the long block in my 92 Z28 and understand that the TBI from the 305 is a direct bolt-on to the 350. Both have the center valve cover bolts. I also understand that the only critical mod is swapping out the 19psi injectors used in the 305 for 22-24psi injectors used in 350's. Where can i purchase these higher pressure injectors? Any other usefull advice would be greatly appreciated!