I have a 4.0 and some times I have to use a rope and pull start it. I've pull started my old six banger a few times as well. Oh don't put some stupid car parts on that thing. If it catches on fire your Ins. company won't pay off. Check to make sure the battery is putting out the canking amps to turn the starter. And check all of the conections for that white crap. Should be a top mount to keep it away from water.
Marine parts are sealed to keep water out and sparks in. Don't use auto chiat.