The 216 probably has a steel cam and should use a distributor with a steel gear. The '55 distributor probably has a cast gear designed for a cast cam. I don't know if there is any problem with running a cast gear on a steel cam.

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"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.