I recall some of that run,
A hard got win in Bulgaria, thanks to a Gary Mackay debut goal. The home draw to yugoslavia was a good result we had gone to Belgrade and got beaten, by a good side,
The friendly draw with Spain I'm sure saw Gary Gillespie make his debut and he strolled through that game,
But as you see we had similar results, ie narrow wins, and dogged defending, and the squad around that time was far superior to the current one,