No mention on that leaflet of the M8 and Parliamentary Road seems intact so does that narrow the window to pre 1971? I remember the destruction at Charing X when they were building the road, just can't remember the year!
According to http://www.cbrd.co.uk/motorway/m8/timeline.shtml here are the opening dates for each section of the M8. 1970 is the date given for the Kingston Bridge
1965 J4-5 Harthill Bypass
1967 J5-6 Harthill - Newhouse
1968 J26-29 Renfrew Bypass
1968 J15-16 Glasgow IRR, Townhead Section
1969 J3-4 Dechmont - Whitburn
1970 J29-30 Bishopton Bypass Stage I
1970 J19-20 Glasgow IRR, Kingston Bridge Section
1971 J2-3 Newbridge - Dechmont
1971 J16-17 Glasgow IRR, Woodside Section
1972 J18-19 Glasgow IRR, Charing Cross Section
1972 J17-18 Glasgow IRR, Woodside - Charing Cross
1975 J12-15 Monkland Motorway Stage I
1975 J30-31 Bishopton Bypass Stage II
1977 J20-26 Renfrew Motorway
1979 J11-12 Monkland Motorway Stage IIa
1980 J8-9 Ballieston - Glasgow City Boundary
1980 J8-11 Monkland Motorway Stage IIb
1995 J1-2 Edinburgh City Bypass - Newbridge