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This of course opinion only, but I would stick with the reduction starter. It is lighter, compact and should have less current draw. It is what is on my engine for the last 33 years, 30 0f those being mine. Mine also has two shims and the pattern looks good, so they stay. If you have a local rebuilder you could have it checked out but usually they work or they don't. Unless it is making unusual noises, just look it over for signs of rust or wear on the drive, and run it.

Welcome to the forum! I hope you stick around. You have a beautiful convertible. Lots of friendly people here who are willing to help if you have problems.