There was INS fitted to 707s in 1974. Qantas fitted their first in 1971 and by 74 all were fitted. There was Doppler and navigators prior to that.
I'm not sure what Pan Am had by then but there is no doubt Bali was known as a challenging port.
Out of interest up to that time Qantas didn't operate to Bali but Pan Am did the SYD / DPS trip. From then Qantas did it 2x per week.
When QF got down to 2 x 707 we had about 2 years of the 3 or 4 day Bali trip and our boss couldn't figure out why we wouldn't bid for the 747?