Yes some head porting is in order. The stroker may have more displacement than the 2.0L, but with the same intake tract it can make no more horsepower.
If you’re going stroker for more low end torque then higher compression ratio pistons are called for. The higher compression ratio will give more off boost torque.
Caution, caution on the use of “high strength” pistons and rods. Stronger usually means heavier and strokers are more sensitive to reciprocating mass than the 2.0L. Lighter is better, at least until they break.
Consider ACL main bearings as they can be tri-metal and designed with late model thrust bearings. (
Mitsubishi 4G63 4G64 Bearings with Thrusts
)
If you don’t remove the balance shafts then be sure to replace their bearings.
If you feel the need to learn more of the technical details, and have a high threshold of boredom, then please see my StrokeOrNot document at
http://www.kidzuku.com/StrokeOrNot.pdf)