Peewee said:
			
		
	
	
		
		
			Actually UCF-10 isnt 1UZ-FE
U means 1UZ-FE
C means C class (top spec)
F-10 is chassis (F meaning celsior I think?)
Feel free to correct me
		
		
	 
U = UZ-powered
C = 4-door saloon (luxury), I think
F = ??
10 = coil suspension (at least it does here - Oz - and in Japan
11 = Air suspension
I've included a brief chart showing the JDM-Celsior grading system for the Celsior - this may assist.
1  	A specification  	Sedan  	4550*  	FR  	AT  	G  	4.0  	1UZ-FE  	E-UCF10-AEPNK  	 
2 	B specification 	Sedan 	5300* 	FR 	AT 	G 	4.0 	1UZ-FE 	        E-UCF10-AEPGK 	 
3 	C specification 	Sedan 	5500* 	FR 	AT 	G 	4.0 	1UZ-FE 	       E-UCF11-AEPQK 	 
4 	C-Fspecification      Sedan 	6200* 	FR 	AT 	G 	4.0 	1UZ-FE 	     E-UCF11-AEPQK(F)
The following link 
http://ourworld.compuserve.com/homepages/stepho/newcodes.htm provides a basic run-down of what the various parts of the model codes mean...
From that site your model code would be as follows:
A = Model type (Saloon)
E = 4 door sedan
P = 4-speed, floor-shift automatic
G = Higher grade, general (refers to appointments/trim levels)
K = twin-cam, EFI, economy engine
A = Destination, in this case USA.
Hope this helps.