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Datsun 1200 can run on propane. Datsun had a factory 510 with propane sold in Japan. Although propane contains less energy (so you will take a hit in power), it burns clean, can take high compression and can be less expensive. There are lots of propane Datsun out there -- any gas engine will run on propane. A mixture of propane and butane used mainly as vehicle fuel is commonly known as liquefied petroleum gas (LPG).
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Carburetor
Datsun J15 LPG carburetor
revhead001's L-series Datsun engine IMPCO 125 mixer with a IMPCO J convertor.
I used an origional nikki base and made an adaptor to fit the mixer. The J convertor is just a 1/2 version of the daddy model. Like a B2. Although it is a basic setup it chews around 18 litres to 100km approx. Still beats the price of petrol.
B210sleeper
B210sleeper's Datsun B310 using a European setup from omvl in italy, it's a variable piston carb.
It gets 13 mpg street and 30 highway on propane, still being tuned...
LPG powered A15
Bottom left: propane vaporizer Up diagonally: mixture solenoid Up from that between cone filter: propane mixer 90 deg bend into GA16DE throttle body. Blue hose running all over, oil plumbing.
Using Autronic AL-600D lambda (O2) sensor system.
Fuel Injection
There are LPG direct injection kits, which are cool if you have a factory EFI already, or a Megasquirt, it would be fairly easy to change to injection.
As of 2010 in the US is the propane is too dirty for liquid injection. Leaves nasty tar, propylene, and sulfur deposits in the system.
Turbo
Turbo can be intercooled blowthrough, the vaporizer has a boost reference port, so it's easy. The expense is getting a turbo and making up an exhaust manifold or j pipe.
Air/Fuel Ratio
You can run an O2 sensor just like for gasoline powered engines.
Stoichiometric ratio for gasoline is 14.7:1. Propane is 15.7:1. It is more dangerous to run a propane engine rich than lean (more likely to detonate -- the opposite of gasoline.