The New Thayer's Greek - English Lexicon . This has the Greek word meanings in detail and is keyed to Strong's numbers. This work is from the 1880's but the coding to Strong's numbers is recent. Strong's Concordance and Cruden's Concordance. This gets the words close to the English intended at the time of the KJV translation.
Reprints are easy to find.
Newberry Reference Edition of King James Bible . A useful work that has manuscript discrepancies listed at the bottom of the page for the New Testament. It also allows for you to determine tenses and grammatical fine points of words in Greek and Hebrew. Different words are coded with symbols which help you work through the grammar. Slow and tedious but it works.