This is not my car, so I dont have much info, though I did see it in person a few times.
The conversion was relatively simple from an engine mount point of view, use the stock GC/AR/AS gearbox and mounts, use a factory side engine mount AND cradle from a GD 626 or AT/AV Telstar. The cradle bolts into the GC with a few small mods, I cant remember what, but I think it involves welding a steel plate onto it somewhere and slotting a couple of holes. If you are willing to attempt an engine conversion then you should be able to figure it out.
You must use the side engine mount from either an automatic GD, or a manual GD with a g-series gearbox. You CANNOT use the mount from a factory F2T equipped car that had a manual transmission, but you can use an F2T automatic mount.
Everything else is the same as doing any other engine conversion, find some radiator hoses that work, heater hoses, fuel hoses etc. Wire up whatever computer you have, factory FE3 computers arent the easiest to come across so you'll probably be using an aftermarket anyway. It would help to start with a car that was already EFI.