1st thing I would recommend is getting lots of different size ziplock bags or what you prefer and storage boxes or totes to put components in and a log book to write down different aspects such as making diagrams, documenting part #'s, etc.. along with taking pictures of everything,even stuff you are not sure of their significance. Make sure they are close up, detailed pics too as to see how stuff was mounted,how it comes apart and markings and paint details. Buy an AIM and put it in the reading room (translates bathroom for me) and study it as compared to what you are dis-assembling. If you damage a bolt or anything save it as well in the baggies to compare when you replace with like kind.Save all old gaskets and weatherstrip as samples to compare against replacements. I feel a complete dis-assembly is the only way to do a quality job, but you better decide before the 1st bolt is removed if you have the fortitude and funds to see it through and this may be a long term process. The less you remove, the more compromised the quality of resto, as masking around stuff is usually harder and more detectable as amateur-ish. If you do not feel you have the stomach for this, then my advice would be to leave the car alone and keep it original refurbishing only components needed to make car function well. The next step would be to study what parts are available, their costs. My own preference would be used good parts opposed to reproduction or carefully considering the quality differences which are almost all covered here on the site in forum posts which will save time and money by doing your homework first, except for soft parts like weatherstripping were NOS or good original is hard to find and cost prohibitive for most. Be aware that it will cost about the same whether it is a Z or a 6 cylinder with the exception of some engine components so a restoration has to be a passion with the understanding that the whole endeavor probably will cost more than what the end result will be worth.The word restoration is mis-used as it means to restore as original. Good luck.