71 Scamp surgery(s)

Started pulling apart the 340. Don't know much about it, but it has forged pistons, solid lifters, adjustable rockers and dual valve spring. My issue...no casting numbers on the heads. Ad said 587 heads, but no numbers anywhere on either head. Is this common? Valves appear to be 2.02- 1.6(ish, harbor freight caliper). No paperwork or anything. Looks super clean, bores look great! Any idea what heads they could be?

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