cylinder head identification

i recently bought a 1990 convertible mustang from a friend for sentimental reasons but im curiuos about what type of heads it has on he was modifying the mustang before he passed and the only numbers i can find on the cylinder heads are t9k5 please help me identifiy the heads

the number could also be t9k6

V8

Tran
4 8
3 7
2 6
1 5
Fan


This is the Physical cylinders not firing order.

um not trying to be rude but how is that an answer to my question. i already know the order of the pistons i need the cylinder heads to be identified.

If there's no replies, technicans don't really care about a 1990.