What is HP and Torque on this truck?

Good Morning,
Pretty sure it does not have the original engine. Would like to know what came standard. Was it the L48? How many horses, how much torque, how does one identify a 350 as a L48 and the year it
was built?
1971 Chevrolet K20 3/4 Ton Regular Cab Long Bed Fleetside 4WD 350 4 Speed Manual Transmission
Thanks,
Vic
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