1987 Dodge D150 pickup 5.2l 318 cid

OH! That’s funny! Without machining! LMAO!
Sorry, but pistons will need to be spd Ed for the cylinder bore and there not drop in. Rocker arms are not exactly a bolt on and go ether. Valves certainly are not a drop in item.

I am beginning to see you don’t know much about engines.
Your going to need a book or two to start with. I suggest the following books to read and fully understand before you ask a single question more.

How to rebuild your small block MoPar or Chrysler engine
Who to hot rod your small block MoPar (Larry Shepard)