Your options for regional and national are limited. GoPro has a X30 Heavy class. WKA and USPKS does not have a Masters category, or Heavy division. The F-Series has a Formula 125 with Parilla Leopard at 380lbs, maybe they would add the X30?
Most have removed the 190lbs./200lbs. option for younger drivers in the Masters division. Old guys didn’t like young guys wrecking them. Its a shame, as it gave two different age groups/size groups to race at the national level. Now there is a void for the drivers 18-32 that are 180lbs or more a place to be competitive.