"The Oakie bushings I have seen are 1 piece. Is this an earlier design?"
Original is two bushings and one seal. Original bushings held in place by a dowel.

"I’m 95% sure I have them oriented correctly trans to rear. right to left would be trans to rear."
See attached picture

"I believe the copper shim was in there as well."
The copper is part of a bushing.
Attachments
Bushing Comparision.jpg (59.23 KB, 155 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."