I see no way for Reagan to win in 1968. The mood was not conservative enough. RFK wins the election:
Senator Robert F. Kennedy (D-MA)/Governor Warren E. Hearnes (D-MO) 305 EV. 50.9%
Governor Ronald Reagan (R-CA)/Senator Clifford Case (R-NJ) 233 EV. 47.2%
Because, after all, 1968 was definitely a liberal year.
It wasn't, but take into account that most liberals didn't have a candidate they could identify with that year, so the hardcore ones would vote for Pigasus or just skip the election. RFK would've had better traction among them, far better than Humphrey. Could make it a liberal year, or a less conservative one.