Oil pump drive gear stuck

I attempted to install the oil pump drive gear and it is stuck too far up. This is a rebuilt engine I purchased without the drive gear installed. It is a 318 and has a new high volume pump. I purchased the heavy duty drive gear from mopar performance. Primed the oil pump with a long hex rod tool from mancini I think. Tool fit fine, not tight. Dropped the drive gear in to index it and it barely clears the bottom of the distributor hole. Tried to back it out with a screwdriver and hooked it underneath with a small 90 degree pick but no luck. Did not force it down. I guess my only option is to take intake manifold off? Then I guess I need to polish the hex end of the drive gear if I ever get it out? 20180526_150425.jpg