Upgrade the hard parts first things that would require pulling the motor. Stronger rotating assembly (usually forged) with good rods, crank, pistons and bolts that will handle more than you think you will need. Large pistons and a bore won't set you back any real $$ but good parts will. Make sure the pistons are designed for a boosted motor they usually have a thicker land height. Make sure the rotating assembly is balanced. It's never a problem to have strength and not use it. Cam and heads would be the next on the list, Not sure about your motor but on some the cam can be changed without pulling the motor.
I would do some research on performance building your type and size motor.