Mine was iffy when I bought it about 6 years ago, I'm not surprised, just annoyed. It has 260,000 miles on it, on the original head, and I don't know how well it was taken care of before I got it (I'm fourth or fifth owner).
Just another expensive job, alas. It's an 87, with the 603 engine, not a 67. Ain't dyslexia great? Peter