If you are putting it in a street car a cush mount is the go but for racing (with a tube chassis car) just put a saddle on the top rails that ties to the lugs on the block. The factory mount holes are large so I usually make a "top hat" bush to sleeve them down to 3/8" to match the most common tabs. You can also run front mount plates off the water pump holes, again to saddles and tabs on the top rail.
Roo