I don't know where you came up with the 165/65-15 designator, as I'm fairly certain a tire of that size has never been manufactured. I believe you'll find your 165R15 tires are not .65 profile... more like 78 to 80. Most 165R15's will measure 25.2 to 25.4 inches diametrically, regardless of brand.
As I said, a 185/70-15 will duplicate your current overall gearing, and a 185/65-15 will make it about 4% worse. A better solution might be to find a set of rwd Ford or Mopar 15x6 wheels (same 5 x 4.5" pattern as your 544, literally millions of them in junkyards everywhere) and go with something like 195/65R15's, or even 205/65-15's if you want taller gearing. I'd bet there are folks here on the board that have run these combinations successfully on a 544.
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Gary L - 1971 142E ITB racer, 73 1800ES, 02 S60 T5 BlueBrick Racing
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