Could this come to Assetto Corsa Please? Someone was allegedly making a CART 1989 or 1985 mod for AC about 5 years ago but it disappeared after that
. The Imfamous SDD made a simialer mod, but you probubly know the contraversies surrounding anything connected to them. There is a CART 1999 mod, but I am wholly against paid mods as there are multiple issues with that (at least in my opinion). I much prever optional donating as it allows for better trust and selective funding (and allows more people to enjoy the mod).
About paid modding, from a paid modder's point of view..
There are many more talented modders than myself, and you might be able to find some of their posts on the issue as well.
There is a mod on here that has 20000+ downloads (it's a masterpiece) and the author has very kindly made it free, with optional donating. How much did he receive for 1000+ hours work, in donations? Not even $200. If $0.20 an hour is enough even to cover the electricity of having their computer on, I would be very surprised.
The track I released (built from scratch, 1000+ hours of sometimes very very tedious work) sells for 3GBP. If someone spends a couple of hours learning it and enjoys it, racing there every now and then, and it's on their HDD forever, I think that's good value.
What isn't good value is people charging for other people's work, or making quick, half-arsed conversions from one sim to another.
I doff my cap to guys who put in that much time purely out of passion, but if other people wish to see some form of remuneration for their work, I think that's fair, and obviously if people choose not to purchase the mod, that's their decision of course, there are many brilliant free ones available, starting with Richard Wilks' fabulous works.