That's just one of the pit falls trying to ID and FE engine. Blocks can have generic casting numbers or none at all. Making it hard to impossible to tell from the outside alone. If your not seeing 3 maincap crossbolts on each side of the block that would tell it. The 352 on the block tells me it was cast at the old Dearborn foundry. Only the 427 and 428 blocks remained cast there after Ford new foundry took over all other FE block production. 427's stopped about 72 and 428's were still cast there until 74. Very possible it can be a late 360-390 from there too before the 360-390 blocks went to the new Michigan Casting Center. You can run a solid cam in any FE block. And sure it could be a 390-406-410 besides a 428. Almost anyone guess what's inside. You can measure the stroke. Put #1 on TDC and remove #1 and #4 spark plugs. This will leave #4 at BDC. Use a length of wood dowel or stiff wire. Insert in each plug hole and mark using a common edge as a guide. Measure the distance between. With only .20 difference you need to be accurate. Cyl bore would still be the question tho.

390 has a 4.05 bore and 3.78 stroke. Internal bal.
406 has a 4.13 bore and 3.78 stroke. Internal bal.
410 has 4.05 bore and 3.98 stroke. External bal.
427 has 4.23 bore and 3.78 stroke. Internal bal.
428 has 4.13 bore and 3.98 stroke. External bal.
This with stock stuff inside. How can you tell it's not external balance?