Supercars conducted VCAT [Vehicle Control Aerodynamic Testing] in early November on both of the new cars at Toowoomba Wellcamp Airport.
The aim was to achieve aerodynamic parity between the Camaro and Mustang, however, the homologation process is yet to be finalised.
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At the Adelaide 500 season-finale, it emerged that Ford was unhappy with the test procedure and final result.
It is understood that an agreement has been met for additional test running to be conducted this month.
That is to ensure all parties – including teams, manufacturers and Supercars' technical department – are comfortable with the homologation prior to the 2023 championship.
It is hoped further analysis and verification will finalise all elements of the parity process with some aero parts, such as the rear wing on the Mustang, yet to be signed off.
It is understood the Camaro and Mustang prototypes will return to Queensland Raceway in mid-January in an effort to reach final homologation.
Ford Performance will reportedly send an engine specialist from the United States to watch over proceedings.
Supercars' Head of Motorsport, Adrian Burgess, told media in Adelaide in December that at the time, some of the parity items still outstanding surrounded centre of gravity and engine specifications.
If all parties are satisfied with the outcome of the additional mid-January test, only then will Supercars teams be able to complete their builds with the final homologated parts.
Shakedowns of the Gen3 cars are slated for the end of January.
The first of those will take place on January 30 at Queensland Raceway for Sunshine State-based teams.
Victorian-based squads are then set to run their cars at Winton Motor Raceway on February 1.
Full test days are scheduled to follow at Winton on February 7, Queensland Raceway on February 9 and an all-in affair at Sydney Motorsport Park on February 22.
The season-opening Thrifty Newcastle 500 takes place from March 10-12.