how do i change the head gasgets i bought the set already on 1990 Ford F-150

ford f-150 302ci v-8 pick up

Asked by for the 1990 Ford F-150
go to a parts warehouse and buy a book.i hope you know this is a big job you need tools and hopefully you have an air compressor which would make it alot easier
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That is a complicated repair, I hope you can find a buddy that knows how, its not easy. If done wrong its a nightmare