Andrew motor has the sc400 with a 2J swap.
Talk to him, it wast as hard as people made it sound, The only addional things you have to get are the supra engine mount ( the one on the sc300 will need to be replaced anyway since they are old and most likely worn out ) and custom driveshaft, buy the harness from state and everything else is plug an play.
I have done my reseach because I was planing on getting the 2jz in there.