4runner350swap

im rebuilding a 91 4runner 3vze on a budget. i have spent less then 950 including the knock sensor and wire. im getting ready to put the injectors back and noticed that 4 out of the 6 gromets have the seals at the bottom. i was wondering is there a way to rebuild the injectors within a hardware store so i could buy bluk washers and rubber gaskets. and also if anyone has made their own egr block-off kits. if so what and how thick was the matieral you used.