No the LSJ block will absolutely not work to make an LNF.
However I am sure you could build an LSJ and slap it in the sol/sky if you desired. You will run into several road blocks though... IE fueling needs to have a return line on an LSJ as well as upgraded injectors, LSJ has a slightly higher CR etc etc. However they are fairly cheap to build and are probably a very economical way to get some serious power.
If you really want to go this route, I would recommend calling up DDMworks and talking to Dave about it. He can probably help you out since the Ariel atom they built had an LSJ in it, and yes it was twin charged as well.
John,I just purchased a colbolt 2007 LSJ block. It looks like it will work for building a LNF . Does anyone know the differences, I see some difference in the castings on the block however it sure looks like everything else will work.