Right here, I don't know if there is a site that has all the information about all the switchable parts but if you ask here on a item by item basis I guarantee someone has tried it. Most 240 interior parts are interchangable in all years, even the later dashes will go into earlier 240s, the later ones with knee bolsters are a bit different however. 240<=>740 is less interchangable inside but engine and trannys are tradeable. Non ABS 240s can use all 740 wheels that I've tried and that's a bunch, some 700s with larger brakes can not run 14" or 240 turbo wheels and I don't know about 240s with ABS.
Dave Shannon
Spring Valley, California (San Diego area)
'84-245 200K+
'84-245T 190K+
'88-240 190K+
'01 Jeep Wrangler Sahara 10K
www.volvo2.homestead.com (Opens new window)