Referring back to earlier posts on early 3500S. I have chassis no. 48100763. CHJ 805K Registered 17 /1 72. Made Dec 71. Tobacco lef with (non standard) box pleat buckskin leather seats.
Be very very careful. Matching numbers syndrome is a viral disease close in transmissable properties to Covid 19.
Once infected the poor owner has no choice but to spend countless hours searching the interweb looking for the original bolts, nuts, and even valve caps for their car.
It starts slowly, usually with an engine number, then spreads rapidly, there is no known cure. Ask any Corvette owner, if you can find one not welded to his laptop scouring ebay.
After conversation with car. expert (Burlem?) I fitted new floats. White plastic, where old ones were brown plastic. Problem cured.
Old floats looked OK , but as soon as I told Biurlem they were brown , he said "That's you problem, you need new floast"