Sub frame woes

Been inactive for a long time (long story).. but I’m running into a set back on the car.

I have a 1972 2 dr dart swinger that I’m replacing the front subframe. I drilled the spot welds out of my donor 1972 4 door. Braced the front subframe and had it media blasted and epoxy primed. Turned out great.

so I removed my front subframe from my car by drilling the spot welds out as well. Patched the floor pan and am in the process of lining up my new subframe. Which has gone smoother then I originally though it would. But my measurements arnt matching Chrysler’s and I’m having a hard time pinpointing the exact measurement points on the chassis. Can anyone give me a crash course for dummies on this so I can see where or why my numbers don’t make sense?

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