Depending what month your car was made would depend on the year block you would need I think.Early built Mopars would have received a 67 model block and later months would have received possibly a 68 model block.I have been told that Jan - Aug 1968 built vehicles usually received a 1967 model block and Sept - Dec built would have received a 1968 model engine block and so on for other years also.Has anyone else ever heard this.I actually have been told this a few times and have looked at cars build dates and seen that this could very possibly be a true statement!