40 cymbals at $70 each....$2800Octoplus .......................$1200Ballpark....................... $4000 Like buying a pig in a poke.......... good luck !!
Classic era, classic kit, and the Cortex finishes are fairly bulletproof! Butcher block wasn't the most popular finish, but it's desirable for some.
With a correct Ludwig snare, and hardware, and in great condition, I'd say the kit could fetch up to $1500, maybe more from a very motivated buyer. Timing is everything though, and the economy is pretty soft for used gear right now... a few years ago, they were certainly worth more. And let's be realistic, concert toms haven't made a comeback yet (although I'm mounting a one-drummer campaign to change that!)
But the cymbals are a real variable here. Assuming they're all '70s vintage, which means they're probably all A's, you can figure roughly $5 an inch. But that varies by cymbal somewhat. A 20" crash or ride for example would be fairly priced at $90-100, but a pair of 14" hats are not going to be $5/inch at 28"! Figure $100-150 max on those. But if selling en masse, you'll need to come down a bit on that because the overall price will just be too high for most people.
A little more clarification will help with determining value:
Sizes, models & conditions of cymbals
Condition of drums
Which snare?
Case/bags included?
Bermuda