I had the pleasure of briefly meeting Steve Baker at a Mallory Post-TT meeting a few years back. Very gentle and humble man. He was 'parading' a full-fat TZ750 alongside a bunch of other classics (RG500s etc) but he couldn't resist giving it full noise on the start/finish straight. They are still very, very fast bikes, despite the (relatively) low power output.
It still amazes me that Mick Grant was speed-trapped at 191mph in 1977 at the TT