BOTH have done it.

Unfortunately, I haven't seen either around here recently

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1983 Ranger (with 5.0L Mustang powertrain)
1985 Mustang V6 (getting '94 SEFI upgrade)
1990 Escort (leaving the 1.8L alone...LOVE getting 38 MPG when the gas prices creep up!)
1991 Ranger (going to get rid of the 2.3 and put in a 4.0 (4.0 engine on stand right now!))
1996 Mustang Convertible (stock 3.8 right now but I have a '95 super coupe engine on a second stand right now!)
1997 Thunderbird 4.6L LX (going to put the body effects from the 95 SC to "sporty" 'er up a bit)