Trouble mating 727 to a 440 - HELP ;)

No. I just pulled it back about an eighth of an inch rotated very little and then tried to seat it more. eventually it got to where it was fully seated. I took a straight edge and drew a line on the inside of the bell housing with a sharpie so I knew that when I installed it for the final time it was in the whole way. You didnt install your flex plate the wrong way did you?