Finn wrote:

Klip, klip ...
... I moved from NJ to Taos, NM ... At 7000 feet here in Taos, I believe that the hp loss is around 21% ... Is there anyone listening that is at a similar altitude... I
would have no problem getting to say 75 mph at sea level in the 87...

Well, I have no tech help for you but ... I ran my 87 Wolfy hardtop 4sp (stock everything except 27x8.5 14 tires) in the northwest near sea level for 11 years and then moved to the AZ mountains where I've been for nine years, at 7000 feet.  I changed nothing, adjusted nothing, and noticed no change in performance.  75 is easy as ever.  Coming up here from the desert ain't fun, a crawl in 3rd gear often, but climbing near 6000 feet in two hours, that just goes with the vehicle.  So I guess I'd be looking for something to fix, not an inherent limitation of elevation.

(And I guess I'd have to add that Taos must be way better than anything in NJ, at any speed.)
lp