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Don't know what the best are, but Head Quarters sells a set. The main body is shorter than the stock one which gives you more room to get the wrenches in. Sounds like a good idea to me.
Colony makes some nice pushrod covers. They make the standard ones with a 1.5 inch clip, shorter ones with a 3" clip for adjstable push rods, and billet covers. Theat are nice pieces and do not leak.