It's so hard to remember 30 years ago, and the more you try, the more you run the risk of imagining what you remembered, instead.
For quite awhile, I wasn't even sure what it was we grew - Mexican or Colombian. That finally gelled in my memory. Many of the plants I've grown bring back scent-related memories, too, and that has helped. The Colombians were sandlewood-based mostly, with what I think was a lime topnote. The high was soaring and buzzy, with a warm, ringing rush that would leave you dazed for a few minutes. At that time there wasn't much unseeded pot available, and our stuff was far better than anything you could buy anyway. We distributed it in paper sandwich bags to let the stuff breathe, it was so fresh, but it would smell up the entire space, heheh.
The strains I've grown that were closest to the old landraces are Utopia Haze (Brazilian IBL), Panama (an assumed IBL), Desfran (Thai/Mexican/Colombian) and Carnival (Unknown). Other than Panama, they all share a similar terpene profile, too.
And it's very difficult to gauge potency when it's been 30 years ago, and you were stoned at that time, too.
Like JB said, I don't remember sticky glistening trichs all over everything. But we were also growing 5 footers under 15 watts/sqft of Metal Halides, so that would be a factor too.
If I had to guess, I'd say potency was in the 10% range. You'd occasionally get killer buds that would make your head spin, but most of the weed was aromatic and not terribly sticky.
But it never had any indica in it. When it wore off, you were just straight, not asleep. The more you smoked, the more f'ed up you got. Most of the sativa hybrids I've grown have that noticeable indica crash that I don't personally welcome. Frankly, I'm pleased to smoke any unpolluted sativa, landrace or no landrace, but it sure is nice to be able to identify and enjoy the distinctions. I already have some very good experience with Brazilian sativas and I like 'em a lot!
Maybe one day I'll find one of the old Colombian phenos for sale - that'd be a trip.