how to replace the fuel injectors on 1991 GMC S15 Jimmy

Apprentice 7fcc12909ae64520525213c612d1ef7ee84ad402e611d9a259270b15abea875b
what would i have to do to get to and replace the fuel injectors on a 4.3L V6 Vortec engine? its a model 220 throttle body injection. a detailed answer would great.
(1) Answer
the spider assembly is under the upper intake. that is the plastic unit that the throttle body is mounted on. you must remove the upper intake to gain acess to the spider, or innjector assembly.