ive not done a zt, but ive done 2 cvh's and my current zvh, tried a few ways and I found the easiest was to drop the pair through the bottom, I made a right mess of the engine bay the first time, but I didnt remove the pullley.lol

I used axle stands and 4 lads to lift the car when we dropped the engine, would be really easy on a set of proper ramps

hope this helps