I found a set of valve covers on eBay for about $30 shipped and cut openings in one to adjust the valves with the engine running. I also welded up a valve adjusting wrench from a old socket and scrap stock. The setup worked quite well and the sloppy valve noise is gone. Very little oil came out of the modified valve cover. If you do this, get the car warm first, turn down the idle, shut off the engine, and then swap the valve cover. Avoid revving the motor with modified covers installed because oil will splash out.