GTS Motor info

Trying to ID a 383. The motor is in a 1968 Dart GTS previous owner claims its the original motor ? I know he also had a 69 GTS around the same time. The casting date is 3.28.68 #stamped on pan rail at the rear of the block is PT383P24480348 on the block next to the distributor has D383. 4 10
I was told 68 used a order number on the body and motor ? Not the vin ?

Info is appreciated

Jim