The GMC CCKW

Want to buy for my 270:

1 ring set 050 or 060
1 crankshaft bearing set 020
1 conn rod 020
1 camshaft bushing set
1 exhaust valve set (42 x 122 x 9 mm)
1 intake valve set (36,5 x 124,5 x 9 mm)
1 valve spring set
1 lifters set
6 valve shields GM2135404

Thanks!

I just had a question. I can salvage a GMC 270 in a 1942 CCKW 353. I am not sure how to identify that it is an original motor from the war. What would the markings be to look for?