Has anyone had any bad luck w/ this change? Is it ok to replace the 3.4 w/ 3.0 permenantly, or will it harm the engine?

Anyone
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97 GTP bright red, Coupe
Rpg PCM, Throttle Position Sensor Enhancer,throt heat shield,shift kit, thrasher cold air intake, ati extension, 180 stat., high flow catalytic converter w/ u-bend replacement straight pipes no mufflers, tyranny cooler, mag. Nose drive sprchgr w/keyed pulley shaft, clear corner lens, mesh grill, clear tail lights, lowered w/18x9 rims, 245/40/18 Dunlop’s,