hard shifting 833

I just put the 4sp back in my Dart and am having trouble getting the shifting
smooth.
I use an aluminum 833 O.D and have had it in the car before. I had it adjusted
perfectly before , so I dont think it is an internal problem.
I did a search on the problem and saw some of you mention clutch adjustment
and fluid changes.
What are your recomendations on these ?

I am running a Mcleod dual friction diaphram clutch and thought I had put synthetic oil in the trany