Thanks for actually posting those. Had to download them and rotate them to read them, but they look fairly legit.
He got pretty ***** as the motor build alone was around seven grand and that is excessively steep. Things like $372 for a new oil pan mid plate and $389 for an AWR oil pan seem excessive, as his original motor should have been fine for these parts. I see no reimbursement for the original block or any other parts as well.
They took 10 hours to install the microtech and another four to do a wideband drivability tune, so a grand in time there. Only $910 was charged for the engine build and install which is actually a little on the low side. There is no mention of removal, so maybe he brought them the car without an engine which brought that down a bit.
Completely not important, but he was only charged $249 for their downpipe. They charge $399 for that now. Maybe they gave him a discount since he was already spending over 14 grand.
There are definitely more efficient ways to spend your money. For instance, $422 for an extrude and hone is a little on the wreckless side, but I guess he said what's another four hundred at that point. The intercooler, intercooler piping and BOV aren't even part of the corksport bill.
Corksport looks to have charged him for an honest $1300 GT2871R, so I don't see how he could have managed to kill it unless it wasn't getting proper oil or coolant, which is very possible. I would be concerned about that with the Godspeed you have in there now.
I don't have any experience with a Microtech but since the car is already running that is a good place to start. Most tuning software is the same. You'll get a table with MAP pressure in one direction and RPM in the other and you'll fill in injector duty cycle or timing advance in the cells. You want to drive through the rev range at various throttle inputs and keep an eye on your AFRs and adjust the fuel accordingly, which I'd imagine the LT10 can log for you.
Once you have the AFRs where you want them, then you can start advancing timing. This I haven't messed with yet, but as with anything always make small changes and keep your ears open for knock.
Some software can get more complicated with accel enrichment, maf input, temperatures, etc. But most of the time simpler is better.
I recommend just getting familiar with the software, keep the boost as low as you can, and log as much info as you can before you start messing around with the tables. You really can't pay someone to tune your car for you, because cars like this aren't just set it and forget it. The tuner will miss some scenario, or you'll install some new mod, or the engine will simply change over time.
Good luck with whatever you decide. But if you do decide to sell it, I am sure there are a few people around here who wouldn't mind taking it off your hands.