Based on what I have read, this block is about 1 week too late to be a candidate for a 135 car. They were built in the same week this block was cast. Supposedly they had mid December dated blocks. But what I would do is look for an assembly date on the front knorbs below head deck to give a better clue.
From a value standpoint, if it checks out good, it should be in the $2500-3k range mostly if someone needs that date.