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I used the flywheel etc from my 4.3 5 speed 04 silvy behind a mild 350 with a nv3500 4wd trans and it worked great. only difference in those 2 clutches seems to be is more springs for less grabby engagement.
it's also 7/8" bigger. i forget the size, but the 350 clutch disks are also bigger than the 4.3 ones