So I deleted the 7th injector on my 1989 Firebird. The injector block off plate you can buy for the TPI V8's will fit the injector hole. However the fuel rail plug they provide will not fit. So after a lot of headache I went to my neighborhood last ditch hardware store with extremely high prices, they will not give up on your project until they have tried EVERYTHING, and found an unlikely solution. Get an M12-1.25 oil drain plug kit by Dorman (part number: 090-038CD) and it fits the rail. I had a previously welded rail that sprung a leak at the end and had a spare rail from a blown motor. Hope this helps those looking to delete it as the cold start injectors are hard to find and the switch is non existent.