Oh yeah, I decided to detour a little north and see the Badlands, Black Hills and Mt Rushmore. Anyone have advice on Crazy Horse or Jewel Cave. I read that Wind Cave is closed due to a bad elevator.
One final item. Forecast if for rain mid to late next week in the midwest. Any advice on driving a Spider in the rain and what to do after the rain, to keep rust away.
The Northern route is awesome. I did it last year in my 1970 Giulia, as detailed here: https://www.alfabb.com/bb/forums/sed...g-country.html
Badlands and Yellowstone are must sees. When I do these trips I alternate between a few hours on the interstate and a few hours off, to save time. I wasn't great about documenting my exact route, but I got off I-90 just north of Badlands then took state highways for a while from there, camping in Black Hills National Forest to see Mt. Rushmore and Crazy Horse. I don't think the Crazy Horse tour is worth it but I figured the $10 or whatever they charge you to get into the parking lot was worth it, to at least check it off the bucket list.
There is not much to see in Eastern SD. After getting off I-90 my route was 240 south/west through Badlands then 44 west to Black Hills for the night. From Crazy Horse it was 385 south through Custer then 16 West to I-90 West at Moorcroft. Hopped off I-90 at Gillette, WY and took 14 north then west for a long time through Sheridan, Big Horn National Forest, and on to Yellowstone. It was an absolutely stunning drive but you should be aware there are long stretches that are beautiful but desolate and out of cell phone range. I was flying solo and that was part of the adventure but it's a big roll of the dice and I was always mindful to have extra food and water in the car. Black Hills to Yellowstone via that route is doable in a day in an old Alfa and the Dellorto's did not have any issues with altitude even at ~12,000 feet in Big Horn.
As for driving a Spider in the rain, make sure the cowl and top drain tubes don't leak and are clear of debris. You've gotten a lot of sound advice here. For my long trips, I always carry an extra alternator and fuel pump. There may not be time to gather these but I would definitely clean the alternator contacts so it's charging properly.
If you are coming through the Upper Midwest next week, in addition to the air show at Oshkosh (beware of traffic) the Weathertech / Brian Redman vintage races are next weekend (July 18-21) at Road America in Elkhart Lake, WI. It's an awesome event and track if you've never been. I am planning on attending from Fri night - Sunday in my Giulia. Feel free to PM me for my contact info if you have any questions or issues while passing through. And good luck! Sometimes you just need to go for it...