2.5" spacer lift

I've been working on my 2001 t4r sr5. My original plan was to go 2" out and 2.5" up. I got the 2" out all done, looks nice, but when I looked at it before I put the spacers on there appeared to be plenty of room......well there wasn't!
I'm trying to get the lift done now so the tires don't rub and here is my question:

Do I need to change any OE on the truck to accommodate these spacers?
Front end of the truck I believe is pretty straight forward but WTH do I know!!
Rear end
Can the OE shocks in the rear be used after the spacers are in?
I found a set of shocks that are 2.75" longer (extended length) than the stock ones. Before I purchase these shocks, I'm trying to find out if I am going to need the shocks or anything else to get this done!? Any information on this or anything else I should or could expect to get this done is appreciated!!

Just a rookie t4r owner asking some rookie questions! I just have to order the parts and I don't want to be SOL when it's time to get this done.