Hello! Your code indicates that the engine is indeed a 327 ci engine, but its actually a 1969 model. It was also made in the St. Catherines Ontario Canada engine plant.
Hope this helps!
Technician/Shop Foreman
GM & Saab Certified, ASE Master Technician
In order to determine that, I would need the casting number, found elsewhere on the block. The code you gave does not reveal that information.
Just a heads up, sometimes the same casting number is used on both 2 and 4 bolt variants, so there is a chance that I may not be able to tell you, even with the casting number, but if you can supply me with that, I will surely look it up for you!