361 ? Question

68 wanna b GSS said
Yes from what I understand they were from 58-65 or 66 mine ends with 2205712-4 so I assume it's a 64?

Bad assumption. All that means is that it was the fourth use of the mold or something like that. There will be a date cast into the block as the casting date. There will also be a build stamp in front of the passenger side head on the deck surface.