P-51b-na & p-51c-nt

[-)-MAILMAN-]

We have the P-51B-NA.
Which block number does this represent?
Which engine does this plane use in the game?
Packard Merlin 61, V-1650-3 or Packard Merlin 66, V-1650-7

We have the P-51C-NT.
Which block number does this represent?
Which engine does this plane use in the game?
Packard Merlin 61, V-1650-3 or Packard Merlin 66, V-1650-7

The P-51B-1-NA and P-51C-1-NT had the Packard Merlin 61, V-1650-3 installed and this continued up to the below listed production blocks.

Starting with the P-51B-10-NA block the Packard Merlin 66, V-1650-7 was installed and this continued with the P-51D & K models.
Starting with the P-51C-5-NT block the Packard Merlin 66, V-1650-7 was installed and this continued with the P-51D & K models.

The Packard Merlin 66, V-1650-7 had a modified supercharger which improved its low and medium altitude performance with a slight deterioration of high altitude performance as compared to the Packard Merlin 61, V-1650-3.

There were slight differences in in engine performance and limitations so I would like to know which engine is modeled in each of these two planes especially with changes to the heat parameters in the latest patches.

Thank you