The only way to be 100% sure on FE displacement is to pull the heads and measure the bore & stroke.

4.05 bore will be a 360(3.50 stroke) 390 (3.78 stroke) or a 410 (3.98 stroke).

4.13 bore will be a 428 (3.98 stroke).

4.232 bore will be a 427 (3.78 stroke).

It's not uncommon to see a 427 that received a .017 overbore to 4.25 since I believe that is a BBC standard size giving a wider piston selection.

Yes the date code on the block should be right beside where the oil filter adapter bolts to the lower left front corner down by the oil pan rail.

Casting numbers can be hit or miss on the FE. Depending on how "virgin" the block is, a FE expert can tell you what the paint daubs in the lifter valley and random chicken scratching behind the flywheel on the block actually means.