I suspect the NAPA pressure plate is not going to fit the 273 flywheel - the clutch might. With the Brewer's I believe it's designed to fit the smaller 273 flywheel with an actual 10 inch clutch. I bought the Brewers package for my 273 - the clutch does measure 10 inches and the pressure plate ears that bolt to the flywheel are what I think they term "scalloped" to fit the flywheel and still use a 10 inch clutch. I would give him a call and and discuss it. Wayne is a Good guy and company to deal with.