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1) No you didnt break the crank. The block / rods / pistons would have died long before the crank (FWIW the crank accounts for almost 50% of the weight of these motors)
2) possible you floated the valves, bending them in the process and now the engine while turning over is making zero compression.. which would be why you think it is just spinning.. try cranking it over while someone watches the belts... or watch the tach.. if you see the tach needle moving while you are cranking the motor is spinning just with no compression.
Crank the car while having someone watch the pulleys on the front of the motor.. if it is spinning you need a head rebuild.
These cars in stock form (stock valves and valve springs) are good for about 7000 RPM... much higher and the spring pressures won't close the valve all the way before the piston reaches TDC!
You say a 4-2 shift release the clutch and overspeed the motor.. I would look to the valves!
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