The best way i found to understand it all, is to grab the block and start playing with it as to what fits etc.
1) Keep all ur ancilleries, double check the brackets fit on the RB30. For the oil filter housing, this is what i did; Have an oil cooler with relocator, so just screw the sandwich plate from the relocator to the block, mounted the pressure sender & oil temp sensor a different way (have a look on the block and you'll easily see what u have to do).
2) All the same holes except for the engine mount brackets
3) Have to re-use ur old ones, RB30 ones are on different angle/length.
4) Not sure about this one, my engine builder took care of that
Hope that helps