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I lost a HG in my 74 GTVEEE last Jan. It was my fault. I did not have the head decked after the rebuild. The shop had to take off .012 to get it flat. These .012 were right where the gasket failed. This is an easy job.
I removed the head in about 2 hrs had it decked and the next day had it back running in 3 hrs more and I was completely taking my time, reading the manual sometimes 2 or three times. Typically before I undertake a procedure I am not familliar with, I will read the procedure about 30 times until I can almost recite it. This may not help you but it makes me much more comfortable.
I blew the HG in a Porsche club event at @ 88 mph. Big fat white smoke, removed the plugs and could see the coolant on the pistions, on the plugs etc. If you attempt this, do not be surprised if the car continues to smoke for a 100 miles or so. Depending on the level of the blow, coolant will continue to burn for sometime.
One more reccomendation, make sure you buy a Reinz HG. That is all I will use. The others don't have enough teflon in them and can be a real b*t*h to removed when blown. And make sure do the torque procedure by the book, including the re-torque.
Good luck
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