6.4 Hemi SRV versus windshield wiper motor.

Just wow. I can't imagine a universal joint mating the stirring stick to the R&P as shown. Even if it did, the joint wouldn't last very long. I know ratrod like builds aren't engineered to go 100K miles anyway. I haven't seen everything modern technology and/or aftermarket offers today either.
I'll just say if it was mine, I would alter the rack mounting to rotate its input closer to inline and a little farther away from end of column.
Good luck with your build.
It works totally fine. Same setup I used when it was a 340. The only difference is I had to move the lower bearing back 1” to clear the valve covers.