Yes that is a twin SU fuel pump fitted to carby V12 jags.  It uses a points system that is impossible to set right and they burn points - they are extremely problematic because of the points.  The pump themselves are great.
I have converted the one I have to electronic and now works great.
Dunno about the gearbox through but I believe the gearbox out of a Nissan Urvan/Canstar was a common 5 speed conversion.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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