Throttle bodies from motorbikes seem to be a common way of injecting an older car.
Yep. they are a great intake upgrade for a tuned 4 pot and they sound almost as good as a pair of sidedraught carbs. Not quite the same but they bark nicely. 
Or another was I saw was the other weekend at a car show, where the owner of a Morris Minor had bolted a K1200 motorbike cylinder head to the block of a (1400?) Marina engine! :-?
I've heard about that conversion. The bottom end is an A series. Why they don't bin the whole A series instead of just the head I'm not sure. 
A series - quite an antique - I am not a fan of them.
The ports are quite poor, the crank design is not good, yet it is worshipped.
Good.
Because they're the devil's work when it comes to fuel injecting them with their siamesed intake ports. Useful only as a door stop / boat anchor, etc. 
But then I like the old Hillman to Talbot lump (come across a few in Rootes Group cars and my Sunbeam), but lots don't, short stroke, large bore, 8 port head, capacity for massive valves, crank good for 8000rpm or 200bhp, cam high in block for short pushrods. However non crossflow.