if you really want a 240 manula, wait to find a manual.
cause auto->manual swap isnt worth it. its a pain in the neck. an expensive pain in the neck.
but if youre up for it, here are some sites
http://www.cautioncreativity.com/briand/trannyswap.htm
http://www.240sx.org/links/installs/s14_5speed_swap.htm
hope this helps a little