I had my power one rebuilt by a company in California. Found em through Hemmings. I would not be surprised to find a manual cylinder is harder to get done. Mostly because I think there were a lot less of them to begin with.
Good luck
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John C. De Fiore BCA # 3757
56 Super 56R Purchased 1974
69 GS 400 Convertible Added in 2003
69 Electra Limited 2 dr.( well, no longer limited although still unique) Purchased in 1995 or thereabouts
78 Estate Wagon added 10-2008
95 Riviera Supercharged (sold) 2006
06 Lacrosse CXL
"I wonder if I can get the Feds to bail out my old cars?"
Member of the UPSTATE NY CHAPTER
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http://unybca.skyphix.com/