I’m wondering if it would be worth it to restore my 67 L78 back to original. It currently has a 350 ( very strong ~350hp), a borg Warner T10 4 speed and a 10 bolt rear end. I do not have any documents on this car, only the trim tag that identifies it as an L78 car. It is a running and driving car.

Well it sounds like there's not much original left, would cost a lot to do so I doubt from a resale standpoint you'd come out ahead.
Here's one that's been done selling at a net loss.
https://www.cars-on-line.com/85670.html