The Plymouth Weslake DOHC Motor from the 60's

Is that the same as the ball stud hemi?

Yes. That IS the ball stud Hemi.

Arruza bought it from Landy.

Then he put it in Tom Hoover’s 69’ Cuda that had W-2 and other Direct Connection stuff on it as a test bed over the years.

BUT never had the ball stud Hemi in it. Lame move, IMHO.