Late to the party, but did you ever get the front end clunk sorted? My guess is shock bushing, ball joint, or loose brake caliper.
Glad to see you chose the real sports car version (hard top, manual trans). That car was a classic the moment it rolled off the assembly line.
I love the sound of an I6, or even better a turbo 6. Of course that can be good or bad, depending if you are talking repair costs vs performance. Is yours turbo?