Identifying an engine block

The block normally has the date code and the part 
number cast in near the oil filter mounting pad face. 

FE Block 352-390-428-427

A  352 is considered the engine family and 352 is typically found as a raised cast in number on the front face on the block below one of the cylinder heads. (I can't remember which side off hand.) Even if you have a 427 block it should normally have the 352 on the front face. When they say "water jacket" they are speaking about an area inside the block. The water jacket is the area around the cylinder bore where the water flows to cool the block. In order to see the 428 number you have to remove one of the block freeze plugs to see the 428. (I'm not sure which freeze plug either.) You will not be able to see the 428 number once all the freeze plugs are installed. 
Externally the FE blocks are pretty much the same. Let's not get into a detailed discussion on the specifics between
the various engine blocks for example 427 cross bolt mains, 428 SCJ and such in the FE family. That's not what you are after here. "Installed in a car" it would be very difficult to tell if an engine is a 428, a 390 or a 390 block with a 428 crank. 

If you have the heads off you can very easily check the block cylinder bore diameter. If this checks out and the date code checks out then you can be assured that you have a 428 block. 

Dave Mathews - 1967 Shelby Registrar on factory installed 427 in 1967 GT 500's

Only 3 cars were provided with 427's from the factory. No other cars have showed up, and because we have so much factory info., I don't think any will. We don't have any data concerning any dealers putting in 427's. I don't even have dealer data submitted by any owners confirming their cars had dealer installed 427's. When 390's are mentioned, they are usually referring to 68 Shelby's because of the 68 engine shortage. There were only a couple 67's and they were engineering cars which most likely converted to 428's anyway.  We have no data of any GT 350's being converted to GT 500's by the original dealer. 

The 351 Blocks - Windsor and Cleveland, How do you tell the difference?

If you were looking at a 351 block how do you tell if its a Cleveland or not. An easy way is to look for the tag under the coil. The 4V Cleveland had a M code. The 2V Windsor and Cleveland had a H code. That code is
also on the vehicle ID number The top line on the Ford ID plate, the warranty number has an engine code. 

Inside the engines the Cleveland has different sized main bearings, larger valves, smaller spark plug holes, and
semi-hemispherical combustion chambers from the heads. The Cleveland was introduced in 1969. the bore and stoke are the same on the Windsor and the Cleveland.