Will 70 Dart V8 K-member fit 65 Barracud?

Nope. All of the center links are the same for the early A's. Let's try not to confuse this guy more than he likely already is.

Sorry, Evan....
The A body was originally designed for the slant six so there actually are 2 types of center links. The shallow offset one is the slant six version. The deeper offset works on both slant six and V8 models.