Contact S&W.
It depends on how old it is. Needs to be examined by a gunsmith.
You should contact Smith and Wesson directly to get the correct answer to your question.
Contact S&W.
No
Not recommended
There is no simple answer. It will depend on the exact model and when it was made. Best to call S&W to get a correct and current answer.
Not recommended
Yes
NO
Mid 80's. Call S&W and they will tell you when it left the factory. Standard Catalog of Smith and Wesson, 3rd edition.
1. It can, but, it is not advised. 2. It is stated by Smith and Wesson that the model 14-3, which is the third change of the model 14 can safely shoot plus P ammunition.