HG's at 150+
Pete,
The answer is yes, my 95 has 152,000 miles on it...original HG's, and it runs pretty strong, all things considered.
Course, FORD made a few chnages in 94-95 as far as the HG's go. But, in college I had a friend with a 90 that went 230K then the clutch, and HG's went within about 2 months of each other....no too bad.
I truly think that if you don't work your car too hard those HG's will last a long time. Good exhaust should definitely help. If a little ole lady drove (so was mine...) then I bet you have a long way to go with no problems. Preventative maintanence and a light foot will allow these cars to run forever. No bad considering how advanced they were in 1990.
Good luck,
Scott