what is the model of your car? and what engine does it have?
its a pretty straight forward swap... but if you need to ask such questions its prob best if you get some experienced help.
some tips with running 20vs:
always run it on the BEST fuel you can. these are designed for 100 octane.
run a catch can, NOT a plumb back type, you want to remove all fumes from the intake.
do not run a pod filter. run a K&N panel filter in the stock box and make a cold air duct to that box.
fit new leads, the coil lead needs replacing every year.
before you put the engine in do the following:
clean out the intake tract, including the TBs. take them off and use carb cleaner.
change the cambelt, tensioner and water pump. also change the little rubber pipe out the back of the water pump USE GENUINE PARTS ONLY.