Simply not do-able apparently the 3SGTE was a bit of a tight squeeze lengthwise (Won't confirm nor deny) so the RB26DETT In-line 6'd be FAR too long and would require some SERIOUS frame mods to put it in- by then the price'd be astronomical and not worth it- don't even get me started on the transmission.
Your best bet'd be to get a rear clip from a JDM MR2 GTS- with a 3SGTE the engines are capable of 600+ rwhp and there is a huge aftermarket (including parts from places like NZ/Australia, Europe and Japan) if you look. Plus the fact that it's a rear clip means you are all set to go
