[bertfam]

The first (3793310) is an Oil Pump Assembly for a 64-67 Nova with a V8.

The second (3860345) is a Speedometer Driven Gear, and has a LOT more applications:

62-65 Nova with 3.36 axle and 6.50x13 tires.
64 Chevelle with a 3.36 axle and 7.50x14 tires.
65 Corvair with a 3.36 axle and 6.50x13 tires.
65-66 Chevelle with a 3.70 rear axle and 7.75x14 tires.
67 Chevelle with a 3.55 axle (exe Turbo Hydro) and 7.00, 7.75 or F70x14 tires.
67 Nova with 3.31 and 3.36 axles and 6.95x14 tires.
67 Camaro with a 4.10 axle (exe Turbo Hydro) and 7.00 or 7.35x14 tires.
68 Corvair with a 3.55 axle and 7.00x13 tires.
61-64 Corvette with a 3.70 axle and 6.70x15 tires.
67 Corvette with a 3.55 or 3.70 axle with 7.75x15 tires.
67 Corvette with a 3.73 axle with 8.15 or 8.45x15 tires.

There might be more applications, but I only have books up to 1969.

Looks like Rick beat me to the punch!!

Ed