Question: The 1967 Trans-American Championship was the second running of the Sports Car Club of America's Trans-Am Series, which year would also mark the debut of Mercury, with Dan Gurney winning at Green Valley for the company in its new Cougar, Gurney also reached racing's highest levels starting in which year?
Sentence (from "Dan Gurney"): Daniel Sexton Gurney (born April 13, 1931) is a retired American racing driver, race car constructor, and team owner who reached racing's highest levels starting in 1958.
Relevant evidence: Yes