hello to all. i am very very new to flashing and tuning. i have a 91 chevy 1500 that my son and i have built. the engine is vortech block and ported heads. all the internals are from a LT4 and we are using 1989 TPI intake with 0411 pcm with 2001 vortech tune. we are changing the cam to the LT4 hotcam and i converting the hyd roller lifters to mechanical. my question is, am i going to have to change the tune for it to proform properly? thanks in advance and i appauligize if this is posted in the wrong place.