So, it's not correct for this engine but should work anyway. Right?
I can't say it is or is not correct for your engine/car. The '67 intake has a different configuration under the carb - its a one year thing. The attached pic on the left is '67 & the pic on the right is '68. The Dec '67 date would put the carb as typically a 1968 model, but, Pontiac does not always follow the rules 100% - it could have been replaced at some point or it could have been a dealer replacement.
I do not know enough to tell you if the '67 carb is specific to the design of the intake or how to tell. I would PM geeteeohguy
as he would know this. You may also have to make sure you use the correct under-the-carb gasket for your combo, again geeteeohguy will know.
Yes, it should work just fine.