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Re: 81 K5 "Arctic Blaze" H.O. 5.3 / SM465 swap
The reason I went after market was to have as few moving parts as possible, and I already had an older manual clutch style bellhousing. I went with the NFW1050 so I wouldn't have to shim the bearing and so I could use my old style clutch. The NFW1050 makes up the difference in spacing from the block mating surface to the crank, so your set up should work just fine.
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