Re: 2.3 OHC Swap
I thought the escorts had a 1.8 or 1.9 Engine. Being as the Tempo is a lengthened escort platform, everything will bolt up. The issue is going to be the wiring/computer.
Also, the escort GT's got the "performance geared" tranny. So one of those would be a plus.
As for a 2.3 Lima. There's a guy that has one bolted to an MTX3. But he had to hack the car apart and reassemble it around the engine. No big deal for him because he was building a pure race car. Non street legal.
If your going to attempt it, the escort engine would probably be easier.
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1991 Topaz GS (2.3/auto) (gone with the ex Wife; I'll miss that car)
1999 Grand Marquis GS (4.6/auto)