We're all in the present; none of us can see the future. And we're all going down our own paths to our own goals.
So there's only one question you've gotta ask yourself:
"Do you care?"
The hot air GN may or may not be woth "more" money one day. But do you care?
The LS engine is far more optimized and makes more power to go fast. But do you care?
The hot air V6 is unique and it's a Buick engine. But do you care?
Buick purists may hate you for unbolting that incredibly niche part of history. But do you care?
Etc.
Do you care about speed, do you care about being interesting, or do you just care about having something that feels nice?
It's best to give yourself your own reasons for doing things.
Your starting to think with your pocket book instead of your desires. I've got an 84 turbo GT mustang convertible one of I believe 714 built and one of one on color that I have hung on to thinking it will be worth $$ - wrong. The same will be with 85 GN, they are not desirable. The car will probably be worth more as a well done LS