Hmm?
Does this resource exist?
One idea is to use the invaluable site flyershistory.com which has the independently set boxscores (I think the maintainer has used newspapers to construct them) and compare NHL.com and his data.I doubt it is accurate enough. Only way to test would be to find the boxscores for 80's games and then watch them to verify over quite a few games. If you start seeing alarming errors within your first 5, you'll probably see if there is any value in watching anymore to see what the margin of error is.
One idea is to use the invaluable site flyershistory.com which has the independently set boxscores (I think the maintainer has used newspapers to construct them) and compare NHL.com and his data.
Hmm?
I might be off on what is being asked, but
I would think that human error regarding primary assists is probably very, very low. Low enough that I personally wouldnt worry about it.
Secondary assists, on the other hand, are messed up a lot just from games I have watched.... ever since I could rewind and watch the play again on my tv, its become even more clear.
I would trust old boxscores for primary assists.