to the best of my (and my partners) knowledge, there is little or nothing in common with a 3T or 18R... (for the record, she's running a 2t/3t hybrid, i'm running 18RG) the 3T has a single camshaft in the block, apparantly turning it around is no big deal. the 18R series has a single over head cam, ie nothing in the block. only thing i can suggest is that the 2TG you have is acctually an 18RG, i can't think of anything off the top of my head, have a look at the casting numbers on the front of the head if it's 18R the numbers will be something like 1111-882xx... (the xx will differ, might be 88231,88250, etc)
in my opion, 2TG head on 18R block is crazy and hasn't been done
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