Chuck Cox, Lisbon, ME, 1966 Plymouth Sport Fury 2DR HT, 4SPD 383HP

I am third owner of this car, Second owner removed orig. 383HP to put in a drag car he built. He put in a junkyard 383, the junkyard wrote on valve cover "71 Fury". I would like to build an engine that is as close to orig. as I can as far as the block is concerned. My ref. books show that in 66 a 383 was an F code. The car had a G code, which does not show up until 67, along with the F code. Am I right or wrong in looking for the eng. codes on a 383 at the right front of the block by the dist.? How do I know when I am looking at the the block that is closest to what my car came with? Someone I spoke with while looking said that mopar did not make an HP until '67 and my car was probably a late year production 66 in order to get a G code HP that was really a '67HP block.

Can you or someone you know educate me on this issue before I buy a block that is not what I am looking for? Thank-you.