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Generally the trimmer on the Big section of the Variable cap will be AM RF the small section trimmer will be the AM osc. IF cans are fairly obvious (and often have frequency markings to distinguish AM and FM)...Just watch out for a lone FM IF can near the FM detector Those are usually the discriminator and you don't peak tune those.
You say the FM is slug tuned like a Zenith instead of Cap tuned (like most other brands)? If so those slugs are usually on threadded rods that when twisted adjust where they hang/the tuning. The coil with fewer turns will be the Osc and the one with more turns will be the RF amp.
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