i am not familiar with the roads, i usually never ride out there, so i can't help you with that one. the roads are well marked, just keep an eye out for the GC and an arrow in red, but there's one marking in the first few miles that you have to look for. i still have the cue sheets from the 55 and 70, i can scan them and PM them to you if you want, just let me know if you want them...

and check this URL for the directions to the starting point, it's not the same address that you have...

http://huntingtonbicycleclub.org/document/94104