From memory the MPFI had a slightly higher compression ratio but this shouldn't really effect performance if using a carby block.
What you need are the heads, intake manifold, wiring, computer, air flow meter, Y pipe with the oxygen sensor in it, the MPFI dizzy and then time to lay out all the wiring, cut it down etc and do the engine work.
I've done it - then shortly after finishing all that work I learnt about the EJ conversion. I've done that too now. The EA82 MPFI is pretty good for what it is, I found mine super reliable. The problem is that it's still bolted to the EA82 at the end of the day - those oil leaks and tappets drove me nuts.
Also by going with the MPFI conversion you keep the stock gearbox etc so there's no need to mess around with clutches or exhaust mods as you do with the EJ conversion.
The SPFI unit would be the easiest conversion as it's pretty much some wiring and a swap of the intake manifold and dizzy. Only problem is that you need to import the kit from the US due to this system not being available from factory in Australia.
This all depends on what you want to get out of your L too. Consider engineering of the EJ and other costs associated such as insurance once the conversion is complete. If you're not good spinning a spanner or reading a wiring diagram and working with a mess of wire I wouldn't recommend doing this on your own. Others would also recommend not paying a mechanic to do the work. Sell the L and get something newer with a factory EJ and go from there
All that said, I love my L, the EJ is a great addition and I've not stopped there as I wasn't happy with the gearing with big tyres... I'm not sure where it'll end, but I know it's been an awesome 7 year ride so far!
Cheers
Bennie
