I have a 2006 malibu maxx ss with 3.9l swapped out motor now have no spark. Everything is connected and it cranks over fine. Need some help trying to pin point what could be the issue?

Got sick of waiting so sent to local dealer and they said they found a bad ground on the crank sensor, got it back from dealer and found crank sensor not even hooked up. Hooked it up and the car now starts but have misfire, removed plug and adjusted the gap. Car runs like new.