So I have a 2005 Cadillac Deville with new coil packs that is down and a 2003 Cadillac Deville running. Can I take the coil packs from the 05 and put them on the 03? Also could I install performance coil packs on a 4.6l Dohc v8?

I have added spectre air intake and performance spark plugs. Next on my list is to replace the coil packs then flow master exhaust and maf sensor. I love these cadillacs when tuned right. I have beat 2016 r/t hemi chargers and challengers in my 05