rebuilding a 273 180 HP engine

If it just blows a little smoke on start-up, you probably just need a new set of valve seals. As far as rebuilding one, except for pistons, it's virtuallty the same as all the other small block rebuilds. Any listing for a 318 or 340 will use the same bearings, cam, lifters, and most gaskets and seals. Some 360 parts are the same too but not all. Check with Summit, PAW, Jegs, Mancini, Mopar Performance, etc. for prices and availability.