Sorry Timco, I'll add my cars to my sig line.
It's a 1966 Triumph Spitfire track car built by Red LeGrand who built many lightweight formula cars, including ones that bear his name. Here is some more info and pics from a Triumph/MG Experience message board:
1966 Triumph Spitfire (LEGRANDSPITFIRE) Registry : The MG Experience
This is the guy who built it:
http://dsr.racer.net/chassis/legrand/history.htm