I pulled out my H-O Racing Specialties catalog dated 1978 and price sheet May 1978. The prices are as follows TC-41 $7.80. The description on page 20 Heavy Duty Distributor Gear
"1966-1978 phosphate coated (parkerized) stock gear for 60 psi oil pumps and cast iron camshafts". HR-89 is not in either the catalog or on the price sheet as of May 1978.
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