car is 2000 ex coupe ej8 A/T

i tried searching for this head stamp,
head stamp is P2J-6 right side of head is “00”
P2J-6 says 97 ex auto but should have 97 on the right side?


also, when searching for a intake manifold, are all automatic years interchangeable?
intake manifold says P2P 1PT-6