Evans finished in 45.3. The next day Smith ran 10.1 for 100m, his best ever. This followed 21.1 from Ken Shackleford, 20.5 from Robert Talmadge and 21.1 from Lee Evans. Later in 1967, Smith ran 45.25 for 400m in London, his best ever auto-time. Altogether, a stellar few years.
Few athletes can claim quite so many firsts, let alone over such a short perod.
He was born on 12th February 1944 and so all the above, and his OG triumph, was accomplished before his 25th birthday.