How do I remove highly resistant screws within an old Stanadyne shower faucet?

I have the perfect tool --- a small torch or butaine lighter to heat it... then spray with

WD-40 Or penetrating oil... The heat breaks the rust that allow oil to enter

Let it soak in overnight before trying to loosen it, I like to tap on

Screwdriver while applying loostening pressure

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Which screws are you talking about? Is this a single handle? Does it also say 'moen' on it? Are you talking about screws for the cover plate or the handle? Do you have a picture? [do not use the torch yet]