after about 10yrs of wanting an RS ,ive finally gone and bought one

its a 91 fester in pretty much original condition

what are the main areas of concern with owning the RS,and any hints and tips to prolong the life of the car
also may possibly up the power,but dont want stoooooooooopid power thats gonna be blowing the blok every sunday afternoon


ANY HELP WOULD BE MUCH APPRECIATED