today I started a clutch change on a friends 62B coupe. Had the most trouble I have ever had with the upper bolts. These have been installed for at least 30 years, heavily laden with oil condensate, grease, and stil a pain to get a wrench on above the starter.

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But it we adapted and overcame. So Bob drilled a blind hole in the bolt heads and pressed in a roll pin so they won't spin anymore. Pretty simple mod, but you need a v block and cobalt drills. But 5 minutes mean you can remove all four nuts from the engine side.
Starter bolt with rool pin installed