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PTFE impregnated anodization is a great way to make aluminum parts slide without galling, but I would have to recommend against using PTFE on any of the parts that see combustion, ie. the block, head and cylinders. PTFE is highly toxic at temperatures above 500°F. If you ever use Teflon grease, you'll see warnings to clean your hands before smoking, and burning a Teflon-coated pan is bad news for your health (I use stainless cookware at home).
It sounds like any of the processes require a tear-down so that parts which see sliding friction are treated. I doubt cryo would treat a complete engine without a teardown because of contaminants.
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