motor mounts
All chevy big block and small block mounts should interchange if you do not have clearance issues to deal with. So, if you have a '69 camaro with a small block and no fan shroud, it probably will not matter which mount you use. There are 2 different heights of factory mounts. Don't recall right now, but I think they are either 3/8" or 1/2" different in height. For example, a '69 big block Corvette uses the short mount. If you try to use the tall mount, the fan will hit the shroud and you will most likely have a hood clearance problem. If you do some research at on-line part stores, you should be able to figure out which mount (tall or short) came factory on your car. Again, it might not matter on your application.
Good luck, Dan