Agree with SledTL but I would do a complete rebuild on the clutches with the miles on your sled, replace bushings, pins, rollers, weights etc. and I'd do both clutches.
Old Abe there's a place up in Lena called Muel's Sled Salvage , call or text 815-821-2409. Not far from you and the first pic on his facebook has a red Formula 500 in it! Good Luck!