The carbs are a little small 45dcoe would be better and if staying with carbs check the vvt has been blanked off, If done on the cheap what flywheel and clutch has been fitted?
If you go fuel injection the car needs a fuel return if there is not one which I assume there will not be so the tank from a fuel injected sierra will be required.
Best to avoid bike throttle body's and get proper ones or go for a plenum.