An issue you aren't addressing when taking a forced induction car on the track is heat soak. You better have one bad ass cooling system thought out. Maybe even an a/w intercooler so as to not to fully block the radiator.

I am doing a similar setup as yours and went a/w with e85... my plan is mainly street, some AutoX, and hit the road course to see what it will do. My main thought is will my car stay cool on a road course for 20-30 mins pounding on it? The turbo is rated at around 1200hp with a billet compressor wheel. When choosing a turbo most have small turbine side wheels which chokes the ultimate power potential. While it may work ok on a 5.3 if you ever step up to a 6.0 or larger the turbine will choke and create a bunch of backpressure. I would buy a new turbo that comes with a warranty. Mine is a T4 style turbo.... a T6 turbo weighs about 55lbs and is dimensionally huge.... mine is at least 25lbs lighter.

This is the radiator I'm running:
CG&J manufacturing (Bryce Thomas Radiator) in Alabama
3 core dual pass custom 33x19x4" radiator $530 shipped
https://www.bricethomasradiator.com/

I have a Ford Taurus 3.8l V6 fan on it. Pulls 4000cfm. The heat exchanger is in front of the radiator and my a/c condensor in front of that.