Congress had got similar vote percentage in 1984 but that's history now and Congress is out of power in Gujarat since 1998.
One thing is for sure, Congress does not seem to have enough fire power on its own to upset the applecart of Narendra Modi but yes, if it gets covert support from disgruntled elements within Sangh Parivar that includes Keshubhai, VHP and Bajrang Dal elements then it could be a different story altogether.
As we say, it's very difficult to predict the outcome of an election in a diverse society like ours but on a safer side, it can be easily said that dethroning Modi govt in upcoming assembly elections will be a herculean task for Congress.