IOTL Levesque tried to convince Bou-Bou to join the PQ in 1966-7, but failed because Bourassa correctly thought independatist economics hogwash. But in the 1970s IOTL, RB described himself, the head of the centre-right Liberal Party, as a social democrat.
So let's say he swallows his objections and joins the PQ. Who succeeds Lesage? How would a PQ Premier Robert Bourassa change the QC political landscape?