360 heads?

When I bought this car last year has a 73 340. I've had other 340's in the past and they both had j Head's. These heads don't have any, x,j, or u but have an II on the front just below the valve cover, they only have a square embossment between the spark plugs.this is the only picture I have at the moment. Are these 360 or just 318?

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