How to identify a 67 specific k-member

Hey guys I recently bought some parts from a guy for a good price. This slant 6 k frame is notched & boxed in for the Schumacher mounts. I have a 70 dart that I'm getting close to starting on. 70% street 30% track for a while. It will be 471 stroker, trick flow 240s & track heat intake.
2 inch coated fenderwell headers
727 4000 stall, no brake yet or 2 step
Tied frames
Minitubs, spring relocation.
3 inch total narrowing of 8.75, 3.91-4.30?
Unsure yet
325 50 15 m&h tires.
Anyways just wanted to know if there are any obvious tells to know it's a 67 k-frame