Need your experience k20 brake line routing and frame differences

[Mts67C10K20]

I am in process of installing a set of inline tube brake lines on my 67 k20
I purchased a set for a 71 k20 as l am install disk brakes and a d44 open knuckle

All the lines fit very nicely from the back around the crossmember and from both sides until they meet the master lines

The problem is that the master cylinder lines do not match up with the lines crossing the front cross member
When I called inline they said that the frame is different between the 67 and 71and just bend them to fit with no other information or resolution

I need your experience to verify this, I thought they were all basically the same in this area
Also if different how do the lines route on a 71

Thanks