I own an '86' 300SDL with a 603 engine (603 018 14 01). I have started getting a puff of steam (not smoke) as I pull away from stop light/signs in the last week (loss of coolant, and undo pressure in coolant system also). I'm an old school hotroder restorer out the 60's and reasonably knowledgeable, a good friend form the Houston MB community whom I trust says I've got a head gasket replacement in the near future. I need to know what I'm up against here both from a parts and materials standpoint, as well as time and labor allocation. There is about 225K on the car, and it has served me well for a couple of years now. Are there "kits" you can buy that have all the parts I need to do the project? Are there other things I should do/check while at it? Special tools that without which are make or break for this job? Manuals, video's, DVD's that walk me through the project? ANY insights are deeply appreciated, thank you