its actually not that much work to make the jap dash fit...
you have to make a couple of brackets for the upper vent mounting points, and then shave a little off the front-edge of the dash where it meets the windscreen, then you have to modify the air-ducting to match up with the blower etc, then you have to make a couple more brackets and re-drill the mounting holes for the vertical supports down either side of the center console... you may also have to move the steering column mount to the drivers side by about 5mm to get the column centered properly in the levin dash plastics... there will be an article up at www.4age.net in a few weeks covering the whole conversion...