If we had VAR in 1976 then all it would have done is stop Tommy Docherty from moaning about an offside goal afterwards. Bobby Stokes was a couple of yards onside, played on by Martin Buchan the United left back. Had he stepped up in line with the centre-backs then it would have been offside.
Problem with VAR is not the use of technology but the way that it is managed. Too often the VAR team seem to overrule the ref on marginal calls. It should be limited to clear and obvious errors. Seem to remember that VAR was managed really well at the last world cup, but this might have been something to do with Pierluigi Collina managing the overall process and everyone being scared of him.