Ive done 2 engines conversions into diffrent cars and i would say lexus running gear and engine bad idea. In that Ford you need a Ford engine or a light engine. I belive the best production NA engine is a k series VHPD engine or the VVC engine. the hole engine and gearbox weights 125kg and 160hp from factory or 190hp for the VHPD. Hense why kit cars use them and Lotus, Areial Atom etc. Also the complete K series can be picked up for £300 plus around £75 for a good ford gearbox and the adaptor plates are also cheap.
Carnt see why you want want to use a Lexus engine? Wiring would be a Nightmare. But if you have your mind set then good luck.