I believe that in 2013 all the Trans Am series cars had LS1 engines in them, now with a Fan base and sponsorship they are running engines to match the body style.
We mocked up this Trans Am Mustang body on my latest track racer Saturday.
The car will weigh 2200 pounds, rack and pinion steering, cup car chassis (for safety), quick change rear end, G-Force cluthless transmission and dare I say it: A 383 500 H.P. Chevy engine.
I had the motor as a spare for my Dragster and decided to use it to keep the cost down.