*Just to clarify i have a 4x4 engine, but am running Rwd through a T5 instead.*

The engine is recently rebuilt, rebore pistons etc, but otherwise is standard, except from the stage 3 parts (803's etc), a 4x4 IC and a T34 with 0.48 housing.

So for starters, would it be a good idea (based on whats been said above) to have the head flowed, fit new cams (which ones?), have the pistons machined to lower compression and have add valve cutouts, and a multilayer headgasket, with Greys and finished with a live map?