engine overhaul

my clk430 engine is getting worked on rite now and was wondering if there were any upgrades I should do or additional parts I should replace while the engine is completely dissasembled on a stand. Here's whats getting done:... Replace piston rings, cylinder head gaskets, connecting rods, valve seals, valve guides, intake gaskets, valve cover gaskets,main bearings, crankshaft timing sprocket, and 1 engine mount. Also disassemble and clean engine, ridge ream and hone cylinders, and grind valves. Any suggestions on other things I should do while I have it broken down, or is that good how it is? Thnx.