Updrilled the remaining AN3 holes on the firewall bulkhead corners.
Fitted the Dial-a-Trim control. The drawing indicates the max center of the control from the left longeron is 3-3/8". The furthest I could fit the contol was about 2-3/8" from the longeron before the cable retainer contacted the tank. Perhaps the reference dimension should be 3-3/8" from the outside edge of the longeron.
When fitting the trim control, it appears there may be interference with the mixture control cable. The mixture bracket is mounted to the lower right of the throttle assembly as seen in pic #3.