You may look at staying on 95 until you get to Florence/Darlington (Hwy 52) exit 164. Then take Hwy 52 west for about 7 or 8 miles and get on Hwy 151. That will eventually become US 601, then US 74..then I485 north (they call it "Outer" loop). that'll take you to US 29 at the speedway.
Its slightly longer mileage wise but that route is 4 lane all the way. When I'm not in the mood for 2 lane country roads, thats the route I take when we go to the Keys every year.
The 527 route is not too bad either.. that's one of my "country roads" choices. From 527 take 341 to US 1 in Bethune, then Hwy 151 in McBee SC to US 601, 74, 485. the only problem with this route is some tight turns in the center of a couple of small towns. I do ok with my 32 foot Bounder towing, but i see your Tuscanny is larger than that.
Either way, you will end up on US 601/US 74 through Monroe NC to 485.
I live in Monroe and travel all those routes, so let me know if I can provide any more info.
Have fun at the races!
Chuck & Pam (the people) - Bobbie the Cat
2016 Tiffin Allegro 32SA & Nissan Frontier