Congratulations on a great find!
I used to work in a bike shop in 1994-96 and both sold and assembled Marins.
The Hawk Hill was actually a bargain at the time. It had a complete Acera group if I remember correctly and the Acera group was actually great.
It shifted beautifully and had adequate brakes. Considering that the Acera was an entry to mid level group set.....it performed really well.....so if you don't have any real problems with any of the components I would consider keeping it as it is.
The design of the Marins was also good at this time.
_________________1991 Gary Fisher, Hoo Koo E Koo
1992 Klein Attitude, Sunburst
1994 Klein Fervor, Nebula Green1995 Klein Attitude, Painted Desert