Bill,
A lot of the pictures of early gassers are misleading. The combination of big racing slick in the rear and small front tire makes it look like the front is sitting high. So, if you look at the picture you show, yes, it looks like the front fenders sit high, but if you look at the running board, it is pretty level to the ground. If you look at true side shots of early gassers, they sit pretty level.
The early rulebooks state "Bodies and/or frames may not be raised to gain weight-transfer to rear wheels.". But those rule were modified and made more specific to take into account that the rear slick would raise the rear of the car. But the late '60s the rules stated "Car must remain level at a standstill when equipped with competition rear tires, except those cars which have a forward rake, an acceptable modification."
While it wasn't specifically stated in the earlier rulebook, the intention as to not allow the gasser body or frame to be used in the improvement of weight transfer. There were other rules, such as the allowed total battery weight, rear bumper weight, and added ballast weight, that were also intended to minimize the weight transfer to the rear. If you wanted more weight transfer in your car, you made it an altered.