In theory, the 2266 is the "correct" piston for a 67.

To replace the pistons pretty much requires the whole motor be torn down.
At that point, there are "better"(more modern design) pistons that could be used.

The problem with the 2266's is they are down the hole .086" on an uncut block, so you don't get any quench benefits of the closed chamber heads.

The two big questions you'd prefer to know the answers to before tearing anything apart, which may or may not be provided in your paperwork are; what is the chamber volume on your heads now....... And if the block has been decked, how much was taken off(or what is the deck height dimension)?

Knowing the answer to those questions would enable you to make a better decision on exactly which pistons would make the most sense.