You'd need to loosen the 2nd bolt, the one that holds the hold-down plate to the underside of the distributor body, to rotate the distributor body relative to the plate and get the adjustment range you need. Both ends of the plate are slotted, so if you run out of room in the short slot where the hold-down plate bolts to the block, adjust the other bolt in its longer slot. That means either pulling the distributor or having the secret decoder ring.
The throttle return spring would not pull the throttle closed all the time, so I replaced the spring