crankshaft gear issue

I was assembling my magnum and putting a comp 2103 timing chain kit on and the crank gear slides right on and I checked and it has slack on the keyway and slack on the bore of it has anyone had this prob ??? what should I do here?? I know the balancer is going to tighten it down but it seams to me that it could have issues. Everybody chime in and give some input please.