scope base help needed

i need a scope base that will allow me to move my scope
back more and higher rings as well for prone shooting..
Now i am too low and too far ahead to get a full view
thru the scope..Works ok on the bench,but no good for
prone..Any advice appreciated....john

ps==for stevens 200...only shooting 3 to 500 yards...thanks

Any one piece picatinny style rail should work for you, since you aren't going past 500 yards I wouldn't worry about one with MOA cant on it. EGW makes a good one but there are several options.

got it all together..I appreciate all the hep and advice from
everyone who repllied...Thanks again..