St johnstone had a great team in that era. I remember going to muirton park on a wed night for the 1st leg of the quarter final of the league cup. St johnstone won 2-0, and we said to ourselves that that was the end of our run as we could not see a way back against this st johnstone side. The following wed , I witnessed some of the best attacking football I have seen when we won 5-2. The rest is glorious history. The heavy defeat you mention weebaw was probably earlier.