I'm not sure, I'll have to check my info, to see what (if any LSD) the TA27 GT ran. If it had an LSD you, I assume it would be the same as the RA25 (though not certain) and you'll need a custom rear-sway bar to go around the LSD. I got one made up on the spot by KMac for my RA25.
Sorry about all the "not sure" and "assumptions" in my reply but the TA27 is quite rare and therefore not much info on them.
Matter of fact, if it's a true JDM TA27 GT then you'd be crazy to change it. You've got a very rare car and if you keep it original then you'll have a gem that many people will admire and want to pay top dollar for.
However, if you're determined to change such a classic, then make sure you keep all the original bits that you take off so you can put them back on before you ever sell it - assuming you will sell it one day. Buy a 2TG or 18RG engine and build that up, and keep the original engine as is.