This year's Excellence Magazine Buyer's Guide lists the SC from $25K to $55K, range is wide as condition dictates price. A running car that needs a lot of work is $25K. This is for US spec cars. I don't know how Euro / gray market affects the price. I suspect you can get $10K tomorrow and it'll be on a flatbed by the afternoon. Or you can fix it up for $15K and still get $25K depending on paint and other cosmetic work that needs to be done, or even more mechanical work.
Classic.com has similar values:
https://www.classic.com/m/porsche/911/year-1982/ if you remove the outliers.