uh....I'd ix-neigh on the CT20 ehhh.
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CT20 to T3 adapter: Where to buy?
From all I could find on the subject, factory w/o customisation. Both the CT20 and CT26 are at 7 psi. But naturally the CT26 moves more CFM(?). And as far as the stock manni, and as I'm just finding out, the CT20s housing are REALLY common to crack. That really wouldn't deter me from using one, I'd just have to use a good one. The prices of the customs will bring it home really quick why.
If I went Turbo on my 22REs(9.3:1 c/r), I'd decompress. And you can either do that w/ an RTE head, or RTE pistons. Doing both (an RTE spec block) will have you at 7.5:1 c/r. With an old in-efficient turbo like the CTs I'd bump the compression up from the 7.5 c/r with either a 22RE head or pistons, with a better turbo (T3) I'd leave the (7.5)c/r alone.
LC Engineering
Don't get excited with dreams of power. The RTEs are VERY limited to enhancements with its old, caveman extinct, very generic engine mangment system.
People have successfully Turbo'd 22REs in the past but just know the distributor is lacking in one key, very important feature to forced inductions. In stock form, IIRC, the dist does not retard as much as the RTE spec does(which requires the RTE computer). And that can be VERY hazardous to your engine under boost levels.
I'd do a T-Chain and bolt on some POWA!!. 22REs last as long as they do partially b/c they don't have allot of power to begin with. The key to 22REs is not expecting much in the first place. I'll take longevity any day over POWA!!