Thanks guys
In regards to the suspension setup his still keeping it IRS at the moment, from my understanding, because he wants the quickest IRS V6. Plus he still drives in on the street and the IRS is handy when negotiating speed humps LOL
Saying this though he'll probably need to upgrade the rear end out of necessity from a reliability perspective, given how hard the power is going to be on the IRS.
In regards to a total build cost, I'm not sure as the build has evolved over a period of time, I'd put the figure at lots all things considered
To replicate that engine, including turbo setup, fueling, tune etc I'd loosely put it at around 20k which would be influenced by the amount of DIY work and mates rates etc.
There is still more in this engine combo, as it's only running 31psi, where it can be running mid to high 30's. I suppose time will tell if it will get pushed that far or not.
Cheers,
Steve