I've just spoken to herberts and they tell me a D6H measures .604/.604 260/270 at .50 on a 108, so that can't be my cam. I haven't got a degree wheel.
Mick

69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36