I agree with Kevin and Banshee completely. There was a huge online argument over on PY last summer with a guy who was "building" a 'numbers matching' 400 convertible. He kept interchanging "numbers matching", "born with" and "numbers correct" terminology. I kept calling him out stating that those were three completely different terms. He insisted those terms all meant exactly the same thing.
The thread got quite heated, and ultimately he was banned from the site. (he liked to use naughty words a lot)
I know he was still selling cars after the fact on Epay, still interchanging that terminology.
Sigh.
BTW, I think what acenho meant by his 'lucky' statement was that you found the original, born-with, engine. I didn't take it as finding a block with the correct part number on it. But I could see it interpreted either way.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold