Try e-gunparts.com
On line auction sites, gun shops, gun shows, Blue Book of Gun Values
find out what engine is in it, and look online for a diagram, honestly thats the safest way to go.
A 1969 big block 396 firing order is 1-8-4-3-6-5-7-2
On most cars the firing order is stamped on the intake manifold. the only thing you will sometimes will find on the distributor cap is the number 1 showing the location of the wire that goes to the number one plug.
you can find a Taurus in safari zone, be patient, it is very hard to find.
Contact Taurus
The firing order of the 305 Chevrolet V8 is the same as all other Small Block Chevrolet V8's. The firing order is: 1-8-4-3-6-5-7-2. I will post an additional link that you might find helpful. It will provide you with torque specs and other valuable information on the Small Block Chevy.
Check old Taurus catalogs
You will have to call Taurus to find out.
Taurus Fire should be in Foodtopia Wave (at the top).
where can i find the door code for the 2008 Taurus
Not sure just what a "firing block" is- you may need to insure you have the proper name for the part. Most gunsmiths are able to work on the older single shot shotguns. SOME parts are avaialble from on line companies such as gunpartscorp.com. Sorry, wish I could be more help-