Warden, this is one of those deals where " if you have to ask if you can do it... you Can't "...
One of the drawbacks is that people who know.. ( not me) indicate that the block must be surfaced ( which means it can not be done in the car) after the sleeves are installed... the lip of the sleeve is designed to be higher than the final height it should be... so grinding or milling is used after the sleeve is seated to bring it to the correct height...
Someday I am going to replace the sleeves in my 240 in the car, including grinding in situ... but I have extensive welding,lathe, milling capabilities compared to the normal do it yourselfer... and I am really stubborn....