This is an interesting one. My first thought when I saw this photo was that its the old Frank Bryan/Red Dawson '67 Shelby Mustang, now owned and raced by Nigel MacDonald. I can't confirm it (and neither can Nigel), but there are a few clues, such as the fact its fitted with the half cage. I do know for a fact the Dawson Mustang became a drag car in the '70s, after its circuit racing career ended, and it was fitted with a Chevy motor. The 'Rat 427' lettering on the side suggests this car is Chevy powered.
