[CrateCamaro]

The THM350 wasn't officially offered as an option (RPO) until 1969, although some 1968 327/275 Camaros did manage to get this 3-speed automatic transmission as part of an internal GM test fleet. The only way to identify if your 1968 car has an original THM350 is by transmission date code. When the THM350 was released in 1969 it outsold the Powerglide 78,849 units to 66,423. However it was only applied to 6-cylinder and small block V-8 (Z28 excepted) cars, as the high-torque Camaro big-block engines were too powerful for the THM350. The transmission model number comes from the nominal rated torque, 350 lb-ft of torque. (cut and paste from the net)

So unless things have changed since my long chat with the boys in the IHRA tech trailer 7 months ago I would assume the rule would still stand. But if anyone has more info please let me know...I will have a pile of crate motor parts for sale and a traditional stocker motor will be going together asap.