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The engine code is the 4th digit of the VIN:

1975/76 F150 V8's: G = 302 2V (2WD only) / H = 390 2V (2WD only) / J = 460 4V (2WD only) / Y = 360 2V (2WD/4WD).

360/390''s share the same block. The bore is the same (4.05), the stroke is different.

Stroke: 360 = 3.50" / 390 = 3.78"

While it might have a 352, it's only possible if the engine's been swapped, cuz the 352 was cancelled after the 1967 model year run ended.

352/360/390 and etc FE engines have 5 valve cover bolt holes per side. The 302 has 6, the 460 has 7.