SPL equivalent of Comet Halley

The last time Hibernian (Hibs) won by a margin of four goals and Heart of Midlothian (Hearts) won by a margin of three goals on the same day was March 17, 1990. On that day, Hibs defeated St. Mirren 5-1, and Hearts defeated Dunfermline 3-0.
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Can’t ever get one past you. .  Your knowledge is terrific and what you don’t know you seem able to find out.  It surprises me I must say.
What about the previous forty years? 

I couldn't find a 3-0 and 4-0 on same day, which I wanted.

But that was a decent second best find.

Beyond that, hmm!, sorry.

I thought as much.  Has to be once since the late fifties when they both had stellar sides.