1973 dart sport 340 (factory 275 horsepower)

Cast or forged crank? Can tell by the balancer. Never seen a car with engine cast so much earlier than the vehicle production date. Are you sure that 1 is not a deformed 2? Most #s cars I have seen the engine was cast 2-4 mo. before production date. Not a yr and 8 mo. Engine should be blue 240 HP, (originally) and duel snorkle is something someone added. Pull valve covers. Should be 587 1.88 heads