[Sunny the Model A]

if you can look down the casting and see them and there is no lip in the way like on some of the later castings, then you can drive them out using a socket like a bushing driver. but if there is a lip a better solution would be to get a tap the appropriate size, tap some threads into the old bushings and use a slide hammer or your own home made version to pull them out. on installation the best method for inserting them is to use an arbor press or at least use a small block of hard wood and go easy on it. beating on it will bust the casting.