Never ran one, but I've seen one run.
Guy here in St. Louis had one years ago, backed with a 4-speed Lenco.
He launched it like 8500 and shifted around 11k (or so he said, and it surely sounded like it too).
It ran like a scalded dog.
It was in a full tube chassis 67 Camaro... I seem to remember mid 8s?
But, it did have a set of aluminum heads, although I'm not sure which.