I would have to say say some older model Taurus 82-91
Only the 2.3L HSC Inline 4 will fit in the 1986 Mercury Topaz. If everything in the engine bay were gutted, perhaps something larger such as a 3.0L V6 from a 1992-1994 model MIGHT fit but it would require a complete running 92-94 Ford Tempo or Mercury Topaz with the V6 engine as a donor car (and, if you could find such a car, it would be more worth your time/money to invest in it v.s. a 1986 model). The automatic transmission from a Taurus WILL NOT WORK in a Tempo/Topaz.
On a Ford Tempo/Mercury Topaz from 1984-1994, you remove/peel back the driver side wheel well plastic piece, (minor disassembly may be required depending on your generation of Topaz/Tempo). The canister is mounted on the outside of the engine bay on the inner body, inbetween the inner wheel well cover, the driver side fender and the front bumper cover. Source ~ Owner of multiple T/Ts past and present.
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