[71blksuper4x4]

I wouldn't worry about finding a date block that close to the assembly date of the truck. Many vehicles of the era have blocks ranging in the 2 or so months before vehicle production date. I know over on Team Chevelle, many blocks have been from months ahead of the vehicle production date, chances are, yours was the same. There are some that were built very close to assembly date, and some that have been made in the year previous, (late year motor built and put in early part of next year) but in reality without the original motor, you will never know. They didn't make engines that day normally, on a assembly line, they don't have time to make a complete engine and put it in the truck coming down the line, they grab assembled engines and put them in when needed. Trevor