Welcome to FBBO from Ontario, Canada. Wow! That is a great looking 1964 Polara 500 you have there. I once restored a '64 Polara 500 convertible and am presently working on my Canadian built Polara 4-door hardtop. I can help you with most of the codes, but not all. The way these codes work is by deciphering the number under the letter.
A5 = 3 speed automatic transmission
B2 = ?
F1 = AM radio
H1 = air conditioning
M3 = back up lights
N8 = windshield washers
P2 = remote adjustable rear view mirror
Q0 R5 = 383 two barrel
T4 = 70 amp/hour batteryI
2512 = shipping order #
0221 = February 21, 1964 build date
642 = Polara 500 2- door hardtop
P4 = bucket seats X = black
99 = red, top & bottom
* however, your car looks to be presently painted TT = dark red poly (met.)
which was factory colour for Dodge 880, but not Polara.
* missing codes could be for power brakes, power steering, or console, which your car has.
VIN plate:
64 = Polara 500
4 = 1964
2 = Dodge Detroit assembly plant
* remaining numbers are sequence numbers
I hope this helps. Good luck with your project, and good on you for keeping it in the family. These are great cars.
Dave
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