The CTW or CTX indicates the configuration of the complete engine as it is shipped from Tonowanda to the assembly plants. Both engines would have identical blocks. Both engines would be machined to accept a ball stud. The difference is that the pilot bushing, flywheel, clutch, bellhousing, and clutch fork would already be installed on the CTX engine. The CTW engine would have a flexplate installed. The engines would also have different distributors and carburetors.
Frames in automatic cars usually have to have a bracket welded or bolted in for the z-bar if you want to convert it to manual transmission. If you installed the CTW engine in a manual transmission car you would need to install a pilot bushing and a stud for the clutch z-bar.
66 El Camino 396/325HP 4-Spd
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