numbers are on the block passenger side of the timing cover,and at the distributor in the rear, they will say the block, if its not cast in the block on the bottom by the motor mounts
im guessing the numbers you have by the water neck are the intake manifold numbers
type in pontiac block numbers and do a search its not hard there a re a few guys out there
but look for those numbers, and head numbers,and intake numbers
and we can find them out on here for fun
www.pontiacpower.net here is a good page