Another alternative would be a '64 to '66 polysphere crank or a 273 crank. Also, the '67 318 also had a steel crank, jus not as good as a real steel 340 crank. (at some point in 67 they started to use the cast cranks). 340 has the same stroke as a 318 so I assume that autozone crank would be a cast 318 crank for that price. I seriously doubt you could buy a real 340 steel crank for $200. If you could, we all would have them.
