Mattax said

Exactly. Those pictured above are not built to 1970 trans-am rules.
There was an independent entry named Robinson in 1970 that drove an A-body Barracuda. The factory backed teams that year were all E-bodies and unfortunately had a lot to work out with both a new chassis and engine.
http://www.historictransam.com/results/1970.pdf

Several of the surviving cars are raced in a series called "Historic Trans-am" here's two - they are updated in various ways, but the original chassis.
Historic Trans Am
Historic Trans Am

Tony Adamowicz is one of several who noted that in '66 the 273's did not have the power of the Ford's but made up for that in handling. Tony Adamowicz, Group44 Dodge Dart

Tony also drove an Autodynamics' car at Riverside in 1970. Tony Adamowicz, 1970 Trans-Am, Dodge Challenger

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