Has your question already been asked?
 

Many of your questions have already been asked by members, and actual MKIV owners. If you do a search, using some key words (ie: heater, head gasket, wheels fit, etc), you will pull up a list of threads with those words (like google does).

Skimming through some of them will get you answers quicker than starting a new thread and waiting.

Give it a try, and then you may still have some questions, of which of course the membership will try to give you the best answers we can.

In addition, please review the MKIV FAQ threads:
http://www.toyota-supra.info/forums/mkiv-faq/