direct or indirect injection

this may be a dumb question but it won't be my first. I have an perkins ad3-152 152UA48990DSL. I was looking at rebuild kits and some call for direct and indirect injection. Can you tell me which one my engine is? My info says this tractor was bought new in 1977.
 
AD means it is Direct injection. Also check out the injectors if direct they fit into the head at an angle on indirect they fit straight down.
Happy New Year.....Sam
 

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