You need to be more speciic about what year 350 you want to see. An early 350 looks nothing like a modern 5.7 L, 350. The exterior plumbing and fuel systems are totally different. Post what year and I will find you a photo.
Typically if the motor has been bored the top of the replacement pistons will have it stamped on top of them. for example if bored 0.30 over this will be on the top of the pistons.
The diogram is usially behind the ratiator if it is not then it would be under the alternator.
If you want the Serpentine Belt Routing diagram for your 350 go on www.alldatapro .com.