Well I can't argue with that...Research the RB into 280zx swap to see how alike the blocks are for mounting.Then if there similar mod a kit for RB into 240.Get a full system wiring diagram for both 280zx and 240sx and figure out what wiring it will take to run the 280 ecu into the 240 harness/dashhttp://
www.lsauto.com/products.asp (they offer a tach to run 6cyl)about all I can help
Keep us posted always like to see new ideas...