Get a 2.0/2.3 from a scorpio. It will have the rwd sump/dipstick/pickup, flywheel, pulleys and belt arrangement. The 2.0 had a twin 48mm inlet. Scorpio 2.0 had lower compression @9.8 and the rs2000 had 10.3 and the scorpio had a cast exhaust manifold. That made them 14ps/15NM lower in power and torque.
If you get a 2.3 you should get a 2.0 engine as well for all the bits. You would want to get rid of the nasty balancer shafts and use 2.0 cams, sump, dipstick, flywheel etc. Visit www.rs2000-16v.com for more info on the conversion.

The engine will bolt right in with sierra 2.0 8v I4 engine mounts. Plus, all the weight is gone into making the unit strong.

Lots more info on the i4 engine on www.fordscorpio.co.uk and the above website.