In need of a engine measurment

I am trying to do a Jeep 4.0L build in a 69 Barracuda. I believe I need a Mustang 2 steering rack in front of ball joints as I dont believe the 4.0L oil pan will clear the OEM steering without notching into the firewall. And I think that will push the shifter too far back.

As such, I need a measurement from a slant six as that will give me a number to compare to against a Jeep 4.0 L with a rear sump area.

If I could get a measurement of a the front of a rear sump slant six to the transmission mating surface, that would be helpful.