i would get the injectors flow tested before running it again as well. fuel supply problems of one type or another can cause this failure, either thepump or the injector not flowing enough fuel to match the requirement from the air mass.

number 3 tends to get slightly more air than the others, so fit the injector that flows the most to that cylinder so that when the average AFR is checked with a lambda sensor you have minimised the possibility of no. 3 running leaner (and hence hotter) than the rest.