Jgerlitz, you're definitely right about landrace sativas being qualitatively different in effect than most modern hybrids.
The problem here is that landrace strains, by definition, do best in their native climates.
Its a combination of temperatures, light, humidity, soil conditions, etc. Some (including DJ Short, famous breeder of the Blueberry stain) believe that SEEDED weed has a different cannabinoid profile, and therefore effect profile, as modern seedless. Stuff grown in the mountains gets more UV light, and is also better than stuff grown at sea level.
So even if you are an experienced grower, unless you happen to own a timeshare in the Columbian mountains, any Santa Marta you were to grow probably wouldn't be quite as good as the stuff you remember from the late 70s.
You can't make a proper Bordeaux with the grapes grown in your backyard.
If you are NOT an experienced grower, know that its more than just long flowering times that makes these strains challenging to grow. First of all, the growing season in most of North America simply isn't long enough to grow these strains outdoors. The frost will come and kill your plants weeks to months before they are ready for harvest. You might be able to grow outdoors if you are growing in a greenhouse or in a place where there is no frost. .. but most people don't have that option.
Growing indoors, these plants LOVE to stretch, again, making them challenging to grow in typical small spaces without extensive and careful training.
Thanks for the input. Looks like I will just have to take a trip to the country of origin to find the stuff I want :-/