Found this list of '63 Nats class winners. Several Pontiacs on the list, including Don Gay in A/S & Bill Abraham in A/SA. Pontiacs also picked up D/SA, F/SA, & C/S.
NHRA Junior Stock
If you click enuff, you can make the list big enuff to read. You have to click the arrow in the top RH corner, then click on the list.