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It seems to me you need to shop around. Unless the market for KE4/Mark 7 Mercurys has taken a sudden leap the numbers you mention are unrealistic.
Per Manual KE4 had Bendix while Mark 7 had Repco/Phelon. Coils are often an issue on both. Servicing either magneto does require some understanding of magnetos and of the brand you are working on. That said, if the upper crankcase seal is to be replaced. the Mercury Service Tools for removing and reinstalling the ,magnet rotor are worth having. Magnet rotor doe not respond well to prying and hammering. I have done it both ways and would never do it again without the tool set. Clever native craftsmen can do work arounds. Because the magnet rotor is a problem to remove and reinstall almost every KE4 will have a worn out upper seal (7415) Fuel mix that sprays thru a failed seal will foul the magneto and attract dirt.
Louis
Louis