89 Camaro head gasket

when a mechanic has to take a head off, he also has to take off the intake manifold at least one exhaust manifold, I dont know what the common mechanic would say but I would suggest both sides being done (not saying you have to) but if a mechanic is tearing half the motor apart alittle further isnt making much of a difference except in mechanics pocket. its not cheap dont know excatly how much but some where in the neighbor hood of $65-$75 an hour, all day job if not more plus parts but by this point parts are the cheapest part