[Tigers] Original engine?

[Thomas Witt]

>>>... whether they were cast in the correct time frame.<<<

At least as it relates to the Tiger and Ford associated engine products, is 
it safe to say there is no specific number relating to each individual car, 
but rather a "time period" of the casting date that can be termed "matching 
numbers?"  And, if so, "matching numbers" would not specifically mean the 
original engine that came in the car?  That of course disregards the valve 
cover with the original engine ID which would seemingly need the "correct" 
number.

Anyway,  if this is accurate, is there debate in the collector world between 
"matching numbers" and original engine? Are there specific date code that 
can only be applied to the Tiger?

Curious peaks my interest, Tom