It's essentially a race car on the street
I'd run Redline, and I'd do samples all the way out to 4,000 miles. Since sampling, I would not worry about ageing out. Just go by the UOA's. If you have the oil flow off the pump (?), I'd consider a by-pass filter too. It'll catch extremely fine stuff the Mann might miss ...
With that much work and money in the car, I would treat the oil regimen entirely different than a DD.
I'd also epoxy a plate magnet onto the bottom of the pan and run a magnetic drain plug on all points. Diffs, tranny, engine, the works.
My fav all time car was a modded Audi Fox back in the day. I got so many tickets in that car I almost lost my licenses. Got banned from the Navy Base because I passed the CO's wife and her mini-van about 5 feet in the air off the RxR crossing
Audi 4000 5+5 Turbo is
the dream car of mine. I have assembled many in my head as the ideal street sweeper
I'd take it over all the current high-zoot stuff out there. You done well brother
Even in retirement and with grand kids, if I got my hands on one it would be over for my license ... How could you/I not put my foot in it now and then