If you are using a 3t crank in a 2t block then you will have to do some minor grinding of the sidewalls and bottom of the bores to create clearance for the increase stroke. There was a thread up a few months ago of someones build that showed how much they had to grind away.
A 3t block will not require grinding but will have the 3t engine number meaning telling your rego authority so you need to work out if this is considered a engine conversion that needs a engineers cert or not. In NSW it would be an owner certified mod.
Head wise between the 2/3tc and the 2tg the valves are bigger in the 2tg head so without any modifications you will get better head flow from the 2tg head. Issues you will encounter are that the upper timing guides for the 2tg are next to impossible to buy new these days. You can easily get the 2/3tc parts so availability will not be an issue.
The dissy bolts into the block so it will work with either the 2/3tc head or the 2tg head.
To make you 2/3tc a 3tg you need some items from the 2tg in addition to the head. You need the upper timing guides, timing cover, and the dummy cam. Also need to rotate back two cam bearings in the block to close off oil galleries. There are numerous posts on here that go into more details.
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