Anyone can correct me if I'm wrong but actually I think they still put out some version of the 366.
Some newer 3/4ton Chevys come with 6.0Liter engines. That converts to a 366.

You take your liters (6.0) multiply by 61.03 and that will get you close to the actual Cubic Inch Displacement.
Otherwise if you know the Cubic Inches take that number divide by 61.03 and you'll get the Liters.
Most calculations aren't exact but it'll get you really close.