Thanks for letting us know where you stand as far as experience.
Doing a turbocharged engine as a first time project is ambitious.
There are several 200 six turbo builds on this forum and plenty help available.
I think that most will advise a two step approach.
Build the engine with the turbo in mind but get it running first without then add the turbo later.
Meanwhile study pages 6 through 12 from this Garrett turbo catalog and ask a lot of questions.
https://www.dropbox.com/s/ddqnkqmf0yjrp ... .pdf?raw=1
A 76mm compressor inducer size turbocharger is way too big for your engine.
What transmission do you have?