One place would be the search feature as a starting point for some of these.
You can also use the pictures posted in the Unrestored Picture threads for at least the basic look and details for the valve covers
For fuel pump there are physical characteristics as Charles mentioned as well as a identifier also. A list of these identifying codes can be viewed in a thread in the Library titled - Fuel Pump Identification and Cross Reference
Also there will be a date stamp. Examples and decoding information is viewable in the Date Coding article in the Library.
Just pick a year section and it will be in the drop down list. May also be some pictures of originals in the 68 Unrestored Picture thread in that section of the site.
For the coil one thread that popped up using the words "original coil" was the one below that at least provides some pictures that might help
https://www.concoursmustang.com/forum/index.php?topic=17479.msg110163#msg110163If you think you're going to need allot of help with checking allot of your parts, maybe starting your own main thread in the Member Restorations/Builds section might be best so that you don't have to figure out where to start of post a thread and it can go in any direction (as long as its car and concours based
it goes. Just a thought