The price quoted is not out of line. With the engine still in the car, this is a time consuming operation. Cam plugs have to come out, cam holding tool installed, all plugs, plug tubes (on engine's so equipped), and coil packs removed. Pull the cam cover, and scrupulously clean the mating surfaces, apply a minuscule bead of the correct sealant (not Permatex), reseat the cover and correctly torque the cover bolts, reinstall everything you removed.
Not difficult, but a lot of time spent, and we would automatically put new plug tubes and seals in engine's that use them.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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