I am restoring my 1964 T-bird. after pulling the engine and trans i now see the number 352 cast in teh block in three places. Each place has a unique number along with the 352. there is 23 352 / 24 352 and 25 352. there is also a W1 cast in the block. The stroke measures 3.5" and i believe the bore is 4". Aluminum pistons are recessed for valves.

there is a number (6C286) stamped into the block on the tab that protrudes from the area above the Oil Filter. Also, the oil filter points downward, not outward.

Do I have a 352 or a 390 here and do teh pistons indicate 10.2:1 Compression ratio?

Any help is appreciated.