You could always stick to your guns and dare to be different. If you can get a tough good L20 for next to nothing, maybe it is worth contemplating abit more. Way up the costs involved with any engine. If you discuss it over with an engineer and they are happy to certify it, whats to stop you? Whats it all cost for you to build a tough A series etc? Whats it cost to put coil overs in the front of the 1000 and make up a new crossmember and draglink that will meet engineer approval and solve the height problem of the L20 all in one?
Look at the costs before you pass it up.
Maybe then you could put that briefcase of extra money ( if there is any )in the back to overcome the weight issues.
Just some thoughts.
Cheers Steve.

if your really that hard up for grunt, go the rotary route. not datsun... but light, compact, and heeeeeeeeeeeeeeeeeeaaaaaaaaaaaaaaaaaaaaapps of grunt!!!!!!!

i'm not THAT hard up for grunt but would just like more, and had the option of a cheap tough L20.
The Rotor route was looking promesing but a 12A is really hard to find and even harder to get parts for. A 13B turbo on the other hand is a little expenceive and my car would be a maniac! not that thats a bad thing but a 600kg ute with a 12B turbs and a lokka is not a car i would like to be driving in the wet everyday to work....though i'd sure give it a go.
I think the conclution i have arrived at is an A14 or 15 turb's or supercharged.
hey another question....if a supercharged engine has a BOV when your foot comes of the throttle does the BOV just keep shooting out the excess boost? because if the engine is still revving hard the chargers still making the boost....just one of my midnight thoughts. hehe

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that depends if the throttle body / carby is in front of or after the supercharger.
if it's after then i would install a BOV to be safe, but if it's in front then the throttle isn't posing a restriction when shut so you wouldn't need one.

Sorry found that the l13/4/6/8 have the same deck height and L20b is 20mm taller and 15-30kdgs heavier but could take 2.4 litres with a Z24 crank if you made the effort to fit one in a 1k.